64646011512 has 48 divisors (see below), whose sum is σ = 175097190840. Its totient is φ = 21546917568.

The previous prime is 64646011511. The next prime is 64646011523. The reversal of 64646011512 is 21511064646.

64646011512 is a `hidden beast` number, since 6 + 4 + 646 + 0 + 1 + 1 + 5 + 1 + 2 = 666.

It is a super-2 number, since 2×64646011512² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64646011511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1097598 + ... + 1154994.

Almost surely, 2^64646011512 is an apocalyptic number.

It is an amenable number.

64646011512 is an abundant number, since it is smaller than the sum of its proper divisors (110451179328).

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

64646011512 is a wasteful number, since it uses less digits than its factorization.

64646011512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73052 (or 73045 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 64646011512 in words is "sixty-four billion, six hundred forty-six million, eleven thousand, five hundred twelve".