66012975 has 60 divisors (see below), whose sum is σ = 139777264. Its totient is φ = 30170880.

The previous prime is 66012943. The next prime is 66012979. The reversal of 66012975 is 57921066.

It is not a de Polignac number, because 66012975 - 2⁵ = 66012943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66012979) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 11847 + ... + 16503.

Almost surely, 2^66012975 is an apocalyptic number.

66012975 is an abundant number, since it is smaller than the sum of its proper divisors (73764289).

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

66012975 is a wasteful number, since it uses less digits than its factorization.

66012975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4686 (or 4672 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 66012975 is about 8124.8369214403. The cubic root of 66012975 is about 404.1504826953.

The spelling of 66012975 in words is "sixty-six million, twelve thousand, nine hundred seventy-five".