66717964 has 6 divisors (see below), whose sum is σ = 116756444. Its totient is φ = 33358980.

The previous prime is 66717953. The next prime is 66718021. The reversal of 66717964 is 46971766.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8339742 + ... + 8339749.

Almost surely, 2^66717964 is an apocalyptic number.

It is an amenable number.

66717964 is a deficient number, since it is larger than the sum of its proper divisors (50038480).

66717964 is a wasteful number, since it uses less digits than its factorization.

66717964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16679495 (or 16679493 counting only the distinct ones).

The product of its digits is 381024, while the sum is 46.

The square root of 66717964 is about 8168.1065125279. The cubic root of 66717964 is about 405.5841066227.

The spelling of 66717964 in words is "sixty-six million, seven hundred seventeen thousand, nine hundred sixty-four".