6440716077 has 4 divisors (see below), whose sum is σ = 8587621440. Its totient is φ = 4293810716.

The previous prime is 6440716043. The next prime is 6440716091. The reversal of 6440716077 is 7706170446.

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 6440716077 - 2¹⁸ = 6440453933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440716027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073452677 + ... + 1073452682.

It is an arithmetic number, because the mean of its divisors is an integer number (2146905360).

Almost surely, 2^6440716077 is an apocalyptic number.

It is an amenable number.

6440716077 is a deficient number, since it is larger than the sum of its proper divisors (2146905363).

6440716077 is a wasteful number, since it uses less digits than its factorization.

6440716077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146905362.

The product of its (nonzero) digits is 197568, while the sum is 42.

The square root of 6440716077 is about 80254.0720275302. The cubic root of 6440716077 is about 1860.5644485894.

The spelling of 6440716077 in words is "six billion, four hundred forty million, seven hundred sixteen thousand, seventy-seven".