66172526664 has 32 divisors (see below), whose sum is σ = 167697503520. Its totient is φ = 21755350656.

The previous prime is 66172526611. The next prime is 66172526681. The reversal of 66172526664 is 46662527166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18883102 + ... + 18886605.

It is an arithmetic number, because the mean of its divisors is an integer number (5240546985).

Almost surely, 2^66172526664 is an apocalyptic number.

It is an amenable number.

66172526664 is an abundant number, since it is smaller than the sum of its proper divisors (101524976856).

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

66172526664 is a wasteful number, since it uses less digits than its factorization.

66172526664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37769789 (or 37769785 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 51.

The spelling of 66172526664 in words is "sixty-six billion, one hundred seventy-two million, five hundred twenty-six thousand, six hundred sixty-four".