64376624021 has 4 divisors (see below), whose sum is σ = 66453289344. Its totient is φ = 62299958700.

The previous prime is 64376623979. The next prime is 64376624057. The reversal of 64376624021 is 12042667346.

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-64376624021 is a prime.

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 64376624021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64376621021) 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, 1038332615 + ... + 1038332676.

It is an arithmetic number, because the mean of its divisors is an integer number (16613322336).

Almost surely, 2^64376624021 is an apocalyptic number.

It is an amenable number.

64376624021 is a deficient number, since it is larger than the sum of its proper divisors (2076665323).

64376624021 is a wasteful number, since it uses less digits than its factorization.

64376624021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076665322.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 64376624021 in words is "sixty-four billion, three hundred seventy-six million, six hundred twenty-four thousand, twenty-one".