75646664657 has 4 divisors (see below), whose sum is σ = 79628068080. Its totient is φ = 71665261236.

The previous prime is 75646664647. The next prime is 75646664663.

75646664657 is nontrivially palindromic in base 10.

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 75646664657 - 2¹⁰ = 75646663633 is a prime.

It is a super-2 number, since 2×75646664657² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75646664657.

It is not an unprimeable number, because it can be changed into a prime (75646664647) 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, 1990701683 + ... + 1990701720.

It is an arithmetic number, because the mean of its divisors is an integer number (19907017020).

Almost surely, 2^75646664657 is an apocalyptic number.

It is an amenable number.

75646664657 is a deficient number, since it is larger than the sum of its proper divisors (3981403423).

75646664657 is a wasteful number, since it uses less digits than its factorization.

75646664657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3981403422.

The product of its digits is 152409600, while the sum is 62.

The spelling of 75646664657 in words is "seventy-five billion, six hundred forty-six million, six hundred sixty-four thousand, six hundred fifty-seven".