66331404 has 18 divisors (see below), whose sum is σ = 167671140. Its totient is φ = 22110456.

The previous prime is 66331403. The next prime is 66331409. The reversal of 66331404 is 40413366.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×66331404² = 8799710313222432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66331403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 921234 + ... + 921305.

Almost surely, 2^66331404 is an apocalyptic number.

It is an amenable number.

66331404 is an abundant number, since it is smaller than the sum of its proper divisors (101339736).

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

66331404 is a wasteful number, since it uses less digits than its factorization.

66331404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842549 (or 1842544 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 66331404 is about 8144.4093708507. The cubic root of 66331404 is about 404.7992786809.

The spelling of 66331404 in words is "sixty-six million, three hundred thirty-one thousand, four hundred four".