6443768957 has 4 divisors (see below), whose sum is σ = 6552985440. Its totient is φ = 6334552476.

The previous prime is 6443768953. The next prime is 6443768963. The reversal of 6443768957 is 7598673446.

6443768957 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6443768957 - 2² = 6443768953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59), and also a Moran number because the ratio is a prime number: 109216423 = 6443768957 / (6 + 4 + 4 + 3 + 7 + 6 + 8 + 9 + 5 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6443768896 and 6443768905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6443768953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54608153 + ... + 54608270.

It is an arithmetic number, because the mean of its divisors is an integer number (1638246360).

Almost surely, 2^6443768957 is an apocalyptic number.

It is an amenable number.

6443768957 is a deficient number, since it is larger than the sum of its proper divisors (109216483).

6443768957 is a wasteful number, since it uses less digits than its factorization.

6443768957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109216482.

The product of its digits is 30481920, while the sum is 59.

The square root of 6443768957 is about 80273.0898682740. The cubic root of 6443768957 is about 1860.8583694679.

The spelling of 6443768957 in words is "six billion, four hundred forty-three million, seven hundred sixty-eight thousand, nine hundred fifty-seven".