64651117020 has 96 divisors (see below), whose sum is σ = 209717695488. Its totient is φ = 14574961152.

The previous prime is 64651117009. The next prime is 64651117031. The reversal of 64651117020 is 2071115646.

It is an interprime number because it is at equal distance from previous prime (64651117009) and next prime (64651117031).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1023664 + ... + 1084983.

It is an arithmetic number, because the mean of its divisors is an integer number (2184559328).

Almost surely, 2^64651117020 is an apocalyptic number.

64651117020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64651117020 is an abundant number, since it is smaller than the sum of its proper divisors (145066578468).

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

64651117020 is a wasteful number, since it uses less digits than its factorization.

64651117020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108739 (or 2108737 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 64651117020 in words is "sixty-four billion, six hundred fifty-one million, one hundred seventeen thousand, twenty".