642709868100 has 36 divisors (see below), whose sum is σ = 1859573885904. Its totient is φ = 171389298080.

The previous prime is 642709868077. The next prime is 642709868111. The reversal of 642709868100 is 1868907246.

It is a super-2 number, since 2×642709868100² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1071182814 + ... + 1071183413.

It is an arithmetic number, because the mean of its divisors is an integer number (51654830164).

Almost surely, 2^642709868100 is an apocalyptic number.

642709868100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642709868100 is an abundant number, since it is smaller than the sum of its proper divisors (1216864017804).

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

642709868100 is a wasteful number, since it uses less digits than its factorization.

642709868100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142366244 (or 2142366237 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 642709868100 in words is "six hundred forty-two billion, seven hundred nine million, eight hundred sixty-eight thousand, one hundred".