64956625421 has 4 divisors (see below), whose sum is σ = 68375395200. Its totient is φ = 61537855644.

The previous prime is 64956625339. The next prime is 64956625463. The reversal of 64956625421 is 12452665946.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-64956625421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64956625421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64956622421) 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, 1709384861 + ... + 1709384898.

It is an arithmetic number, because the mean of its divisors is an integer number (17093848800).

Almost surely, 2^64956625421 is an apocalyptic number.

It is an amenable number.

64956625421 is a deficient number, since it is larger than the sum of its proper divisors (3418769779).

64956625421 is a wasteful number, since it uses less digits than its factorization.

64956625421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418769778.

The product of its digits is 3110400, while the sum is 50.

The spelling of 64956625421 in words is "sixty-four billion, nine hundred fifty-six million, six hundred twenty-five thousand, four hundred twenty-one".