66900016 has 10 divisors (see below), whose sum is σ = 129618812. Its totient is φ = 33450000.

The previous prime is 66899999. The next prime is 66900017. The reversal of 66900016 is 61000966.

It is a happy number.

66900016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66900016² = 8951224281600512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66900017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2090610 + ... + 2090641.

Almost surely, 2^66900016 is an apocalyptic number.

It is an amenable number.

66900016 is a deficient number, since it is larger than the sum of its proper divisors (62718796).

66900016 is a wasteful number, since it uses less digits than its factorization.

66900016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181259 (or 4181253 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 66900016 is about 8179.2429967571. The cubic root of 66900016 is about 405.9526747235.

The spelling of 66900016 in words is "sixty-six million, nine hundred thousand, sixteen".