68245645664 has 48 divisors (see below), whose sum is σ = 153575106048. Its totient is φ = 29243866752.

The previous prime is 68245645651. The next prime is 68245645717. The reversal of 68245645664 is 46654654286.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1878617 + ... + 1914599.

It is an arithmetic number, because the mean of its divisors is an integer number (3199481376).

Almost surely, 2^68245645664 is an apocalyptic number.

It is an amenable number.

68245645664 is an abundant number, since it is smaller than the sum of its proper divisors (85329460384).

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

68245645664 is a wasteful number, since it uses less digits than its factorization.

68245645664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44467 (or 44459 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 56.

The spelling of 68245645664 in words is "sixty-eight billion, two hundred forty-five million, six hundred forty-five thousand, six hundred sixty-four".