66856900 has 36 divisors (see below), whose sum is σ = 158271120. Its totient is φ = 24311200.

The previous prime is 66856879. The next prime is 66856927. The reversal of 66856900 is 965866.

It is a super-2 number, since 2×66856900² = 8939690155220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29290 + ... + 31489.

It is an arithmetic number, because the mean of its divisors is an integer number (4396420).

Almost surely, 2^66856900 is an apocalyptic number.

It is an amenable number.

66856900 is an abundant number, since it is smaller than the sum of its proper divisors (91414220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66856900 is a wasteful number, since it uses less digits than its factorization.

66856900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60804 (or 60797 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 66856900 is about 8176.6068757156. The cubic root of 66856900 is about 405.8654459600.

The spelling of 66856900 in words is "sixty-six million, eight hundred fifty-six thousand, nine hundred".