66717712 has 20 divisors (see below), whose sum is σ = 130904320. Its totient is φ = 32935968.

The previous prime is 66717647. The next prime is 66717727. The reversal of 66717712 is 21771766.

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, 25128 + ... + 27655.

It is an arithmetic number, because the mean of its divisors is an integer number (6545216).

Almost surely, 2^66717712 is an apocalyptic number.

It is an amenable number.

66717712 is a deficient number, since it is larger than the sum of its proper divisors (64186608).

66717712 is a wasteful number, since it uses less digits than its factorization.

66717712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52870 (or 52864 counting only the distinct ones).

The product of its digits is 24696, while the sum is 37.

The square root of 66717712 is about 8168.0910866616. The cubic root of 66717712 is about 405.5835959790.

The spelling of 66717712 in words is "sixty-six million, seven hundred seventeen thousand, seven hundred twelve".