64640620062666 has 32 divisors (see below), whose sum is σ = 143696030961600. Its totient is φ = 21539342064240.

The previous prime is 64640620062593. The next prime is 64640620062679. The reversal of 64640620062666 is 66626002604646.

64640620062666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209046576 + ... + 209355563.

It is an arithmetic number, because the mean of its divisors is an integer number (4490500967550).

Almost surely, 2^{64640620062666} is an apocalyptic number.

64640620062666 is an abundant number, since it is smaller than the sum of its proper divisors (79055410898934).

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

64640620062666 is a wasteful number, since it uses less digits than its factorization.

64640620062666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418405011 (or 418405005 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 54.

The spelling of 64640620062666 in words is "sixty-four trillion, six hundred forty billion, six hundred twenty million, sixty-two thousand, six hundred sixty-six".