68210564868 has 18 divisors (see below), whose sum is σ = 172421150174. Its totient is φ = 22736854944.

The previous prime is 68210564843. The next prime is 68210564879. The reversal of 68210564868 is 86846501286.

68210564868 is a `hidden beast` number, since 6 + 8 + 2 + 10 + 564 + 8 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65613847104 + 2596717764 = 256152^2 + 50958^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×68210564868² (a number of 22 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 5 ways as a sum of consecutive naturals, for example, 947368921 + ... + 947368992.

Almost surely, 2^68210564868 is an apocalyptic number.

It is an amenable number.

68210564868 is an abundant number, since it is smaller than the sum of its proper divisors (104210585306).

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

68210564868 is a wasteful number, since it uses less digits than its factorization.

68210564868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894737923 (or 1894737918 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 68210564868 in words is "sixty-eight billion, two hundred ten million, five hundred sixty-four thousand, eight hundred sixty-eight".