66979885 has 16 divisors (see below), whose sum is σ = 92102400. Its totient is φ = 45806976.

The previous prime is 66979877. The next prime is 66979897. The reversal of 66979885 is 58897966.

It is a cyclic number.

It is not a de Polignac number, because 66979885 - 2³ = 66979877 is a prime.

It is a super-2 number, since 2×66979885² = 8972609989226450, which contains 22 as substring.

It is a congruent 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, 11976 + ... + 16654.

It is an arithmetic number, because the mean of its divisors is an integer number (5756400).

Almost surely, 2^66979885 is an apocalyptic number.

It is an amenable number.

66979885 is a deficient number, since it is larger than the sum of its proper divisors (25122515).

66979885 is a wasteful number, since it uses less digits than its factorization.

66979885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100.

The product of its digits is 6531840, while the sum is 58.

The square root of 66979885 is about 8184.1239604493. The cubic root of 66979885 is about 406.1141601852.

The spelling of 66979885 in words is "sixty-six million, nine hundred seventy-nine thousand, eight hundred eighty-five".