66800900 has 18 divisors (see below), whose sum is σ = 144958170. Its totient is φ = 26720320.

The previous prime is 66800869. The next prime is 66800963. The reversal of 66800900 is 900866.

It can be written as a sum of positive squares in 3 ways, for example, as 2768896 + 64032004 = 1664^2 + 8002^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333905 + ... + 334104.

Almost surely, 2^66800900 is an apocalyptic number.

It is an amenable number.

66800900 is an abundant number, since it is smaller than the sum of its proper divisors (78157270).

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

66800900 is a wasteful number, since it uses less digits than its factorization.

66800900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668023 (or 668016 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 66800900 is about 8173.1817549838. The cubic root of 66800900 is about 405.7520953371.

The spelling of 66800900 in words is "sixty-six million, eight hundred thousand, nine hundred".