66468208564 has 12 divisors (see below), whose sum is σ = 116321169888. Its totient is φ = 33233588600.

The previous prime is 66468208549. The next prime is 66468208571. The reversal of 66468208564 is 46580286466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442719 + ... + 573529.

It is an arithmetic number, because the mean of its divisors is an integer number (9693430824).

Almost surely, 2^66468208564 is an apocalyptic number.

It is an amenable number.

66468208564 is a deficient number, since it is larger than the sum of its proper divisors (49852961324).

66468208564 is a wasteful number, since it uses less digits than its factorization.

66468208564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257846 (or 257844 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 55.

The spelling of 66468208564 in words is "sixty-six billion, four hundred sixty-eight million, two hundred eight thousand, five hundred sixty-four".