66999056 has 20 divisors (see below), whose sum is σ = 130962972. Its totient is φ = 33202176.

The previous prime is 66999007. The next prime is 66999067. The reversal of 66999056 is 65099966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 29593600 + 37405456 = 5440^2 + 6116^2 .

It is a super-2 number, since 2×66999056² = 8977747009782272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66998995 and 66999013.

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, 16721 + ... + 20336.

Almost surely, 2^66999056 is an apocalyptic number.

It is an amenable number.

66999056 is a deficient number, since it is larger than the sum of its proper divisors (63963916).

66999056 is a wasteful number, since it uses less digits than its factorization.

66999056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37178 (or 37172 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 50.

The square root of 66999056 is about 8185.2951076916. The cubic root of 66999056 is about 406.1529025225.

The spelling of 66999056 in words is "sixty-six million, nine hundred ninety-nine thousand, fifty-six".