66864954 has 32 divisors (see below), whose sum is σ = 148667904. Its totient is φ = 19909440.

The previous prime is 66864953. The next prime is 66864983. The reversal of 66864954 is 45946866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66864953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11409 + ... + 16244.

It is an arithmetic number, because the mean of its divisors is an integer number (4645872).

Almost surely, 2^66864954 is an apocalyptic number.

66864954 is an abundant number, since it is smaller than the sum of its proper divisors (81802950).

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

66864954 is a wasteful number, since it uses less digits than its factorization.

66864954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27702.

The product of its digits is 1244160, while the sum is 48.

The square root of 66864954 is about 8177.0993634662. The cubic root of 66864954 is about 405.8817430017.

The spelling of 66864954 in words is "sixty-six million, eight hundred sixty-four thousand, nine hundred fifty-four".