64641136502620 has 96 divisors (see below), whose sum is σ = 137786067619200. Its totient is φ = 25470637108224.

The previous prime is 64641136502617. The next prime is 64641136502629. The reversal of 64641136502620 is 2620563114646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641136502629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2787565986 + ... + 2787589174.

It is an arithmetic number, because the mean of its divisors is an integer number (1435271537700).

Almost surely, 2^{64641136502620} is an apocalyptic number.

It is an amenable number.

64641136502620 is an abundant number, since it is smaller than the sum of its proper divisors (73144931116580).

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

64641136502620 is a wasteful number, since it uses less digits than its factorization.

64641136502620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30367 (or 30365 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 64641136502620 in words is "sixty-four trillion, six hundred forty-one billion, one hundred thirty-six million, five hundred two thousand, six hundred twenty".