65426630657257 has 16 divisors (see below), whose sum is σ = 68625631134720. Its totient is φ = 62302971693888.

The previous prime is 65426630657197. The next prime is 65426630657303. The reversal of 65426630657257 is 75275603662456.

It is a cyclic number.

It is not a de Polignac number, because 65426630657257 - 2²³ = 65426622268649 is a prime.

It is a super-2 number, since 2×65426630657257² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65406630657257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133235344 + ... + 133725502.

It is an arithmetic number, because the mean of its divisors is an integer number (4289101945920).

Almost surely, 2^{65426630657257} is an apocalyptic number.

It is an amenable number.

65426630657257 is a deficient number, since it is larger than the sum of its proper divisors (3199000477463).

65426630657257 is a wasteful number, since it uses less digits than its factorization.

65426630657257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567000.

The product of its (nonzero) digits is 381024000, while the sum is 64.

The spelling of 65426630657257 in words is "sixty-five trillion, four hundred twenty-six billion, six hundred thirty million, six hundred fifty-seven thousand, two hundred fifty-seven".