65625121157 has 4 divisors (see below), whose sum is σ = 65638938816. Its totient is φ = 65611303500.

The previous prime is 65625121141. The next prime is 65625121169. The reversal of 65625121157 is 75112152656.

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 65625121157 - 2⁴ = 65625121141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65625121127) 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, 6901703 + ... + 6911204.

It is an arithmetic number, because the mean of its divisors is an integer number (16409734704).

Almost surely, 2^65625121157 is an apocalyptic number.

It is an amenable number.

65625121157 is a deficient number, since it is larger than the sum of its proper divisors (13817659).

65625121157 is a wasteful number, since it uses less digits than its factorization.

65625121157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13817658.

The product of its digits is 126000, while the sum is 41.

The spelling of 65625121157 in words is "sixty-five billion, six hundred twenty-five million, one hundred twenty-one thousand, one hundred fifty-seven".