66804042 has 16 divisors (see below), whose sum is σ = 135490752. Its totient is φ = 21954240.

The previous prime is 66804041. The next prime is 66804043. The reversal of 66804042 is 24040866.

It is an interprime number because it is at equal distance from previous prime (66804041) and next prime (66804043).

It is not an unprimeable number, because it can be changed into a prime (66804041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77983 + ... + 78834.

It is an arithmetic number, because the mean of its divisors is an integer number (8468172).

Almost surely, 2^66804042 is an apocalyptic number.

66804042 is an abundant number, since it is smaller than the sum of its proper divisors (68686710).

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

66804042 is a wasteful number, since it uses less digits than its factorization.

66804042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156893.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 66804042 is about 8173.3739667288. The cubic root of 66804042 is about 405.7584567938.

The spelling of 66804042 in words is "sixty-six million, eight hundred four thousand, forty-two".