64642662516 has 24 divisors (see below), whose sum is σ = 150845464224. Its totient is φ = 21545756320.

The previous prime is 64642662479. The next prime is 64642662521. The reversal of 64642662516 is 61526624646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70695 + ... + 366446.

It is an arithmetic number, because the mean of its divisors is an integer number (6285227676).

Almost surely, 2^64642662516 is an apocalyptic number.

It is an amenable number.

64642662516 is an abundant number, since it is smaller than the sum of its proper divisors (86202801708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64642662516 is a wasteful number, since it uses less digits than its factorization.

64642662516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449471 (or 449469 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 48.

The spelling of 64642662516 in words is "sixty-four billion, six hundred forty-two million, six hundred sixty-two thousand, five hundred sixteen".