66465625968 has 120 divisors (see below), whose sum is σ = 225089530848. Its totient is φ = 17873104896.

The previous prime is 66465625931. The next prime is 66465625991. The reversal of 66465625968 is 86952656466.

66465625968 is a `hidden beast` number, since 6 + 6 + 4 + 6 + 562 + 5 + 9 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1922221 + ... + 1956492.

Almost surely, 2^66465625968 is an apocalyptic number.

66465625968 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66465625968 is an abundant number, since it is smaller than the sum of its proper divisors (158623904880).

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

66465625968 is a wasteful number, since it uses less digits than its factorization.

66465625968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878751 (or 3878742 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 63.

The spelling of 66465625968 in words is "sixty-six billion, four hundred sixty-five million, six hundred twenty-five thousand, nine hundred sixty-eight".