6429978953 has 4 divisors (see below), whose sum is σ = 6437311620. Its totient is φ = 6422646288.

The previous prime is 6429978949. The next prime is 6429979063. The reversal of 6429978953 is 3598799246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2502700729 + 3927278224 = 50027^2 + 62668^2 .

It is a cyclic number.

It is not a de Polignac number, because 6429978953 - 2² = 6429978949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6429978943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3665018 + ... + 3666771.

It is an arithmetic number, because the mean of its divisors is an integer number (1609327905).

Almost surely, 2^6429978953 is an apocalyptic number.

It is an amenable number.

6429978953 is a deficient number, since it is larger than the sum of its proper divisors (7332667).

6429978953 is an equidigital number, since it uses as much as digits as its factorization.

6429978953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7332666.

The product of its digits is 29393280, while the sum is 62.

The square root of 6429978953 is about 80187.1495502864. The cubic root of 6429978953 is about 1859.5299765251.

The spelling of 6429978953 in words is "six billion, four hundred twenty-nine million, nine hundred seventy-eight thousand, nine hundred fifty-three".