66913508 has 6 divisors (see below), whose sum is σ = 117098646. Its totient is φ = 33456752.

The previous prime is 66913489. The next prime is 66913519. The reversal of 66913508 is 80531966.

It can be written as a sum of positive squares in only one way, i.e., 58491904 + 8421604 = 7648^2 + 2902^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8364185 + ... + 8364192.

It is an arithmetic number, because the mean of its divisors is an integer number (19516441).

Almost surely, 2^66913508 is an apocalyptic number.

It is an amenable number.

66913508 is a deficient number, since it is larger than the sum of its proper divisors (50185138).

66913508 is a wasteful number, since it uses less digits than its factorization.

66913508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16728381 (or 16728379 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 66913508 is about 8180.0677258810. The cubic root of 66913508 is about 405.9799629349.

The spelling of 66913508 in words is "sixty-six million, nine hundred thirteen thousand, five hundred eight".