642755685376 has 88 divisors (see below), whose sum is σ = 1504254751776. Its totient is φ = 268747898880.

The previous prime is 642755685353. The next prime is 642755685479. The reversal of 642755685376 is 673586557246.

It is a super-2 number, since 2×642755685376² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (64).

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 7 ways as a sum of consecutive naturals, for example, 799651 + ... + 1387426.

Almost surely, 2^642755685376 is an apocalyptic number.

It is an amenable number.

642755685376 is an abundant number, since it is smaller than the sum of its proper divisors (861499066400).

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

642755685376 is a wasteful number, since it uses less digits than its factorization.

642755685376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187145 (or 2187127 counting only the distinct ones).

The product of its digits is 254016000, while the sum is 64.

The spelling of 642755685376 in words is "six hundred forty-two billion, seven hundred fifty-five million, six hundred eighty-five thousand, three hundred seventy-six".