64643564214540 has 48 divisors (see below), whose sum is σ = 201113310891360. Its totient is φ = 17238283790400.

The previous prime is 64643564214527. The next prime is 64643564214547. The reversal of 64643564214540 is 4541246534646.

64643564214540 is a `hidden beast` number, since 6 + 4 + 6 + 4 + 3 + 56 + 42 + 1 + 4 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (64643564214547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59855151511 + ... + 59855152590.

It is an arithmetic number, because the mean of its divisors is an integer number (4189860643570).

Almost surely, 2^{64643564214540} is an apocalyptic number.

64643564214540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64643564214540 is an abundant number, since it is smaller than the sum of its proper divisors (136469746676820).

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

64643564214540 is a wasteful number, since it uses less digits than its factorization.

64643564214540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119710304119 (or 119710304111 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 54.

The spelling of 64643564214540 in words is "sixty-four trillion, six hundred forty-three billion, five hundred sixty-four million, two hundred fourteen thousand, five hundred forty".