66668532625 has 16 divisors (see below), whose sum is σ = 83809666512. Its totient is φ = 52945507200.

The previous prime is 66668532577. The next prime is 66668532653. The reversal of 66668532625 is 52623586666.

It can be written as a sum of positive squares in 8 ways, for example, as 2091049984 + 64577482641 = 45728^2 + 254121^2 .

It is not a de Polignac number, because 66668532625 - 2²³ = 66660144017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1929402 + ... + 1963651.

It is an arithmetic number, because the mean of its divisors is an integer number (5238104157).

Almost surely, 2^66668532625 is an apocalyptic number.

It is an amenable number.

66668532625 is a deficient number, since it is larger than the sum of its proper divisors (17141133887).

66668532625 is a wasteful number, since it uses less digits than its factorization.

66668532625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3893205 (or 3893195 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 55.

The spelling of 66668532625 in words is "sixty-six billion, six hundred sixty-eight million, five hundred thirty-two thousand, six hundred twenty-five".