66411860 has 24 divisors (see below), whose sum is σ = 147669480. Its totient is φ = 25001984.

The previous prime is 66411803. The next prime is 66411871. The reversal of 66411860 is 6811466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15888196 + 50523664 = 3986^2 + 7108^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97325 + ... + 98004.

It is an arithmetic number, because the mean of its divisors is an integer number (6152895).

Almost surely, 2^66411860 is an apocalyptic number.

It is an amenable number.

66411860 is an abundant number, since it is smaller than the sum of its proper divisors (81257620).

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

66411860 is a wasteful number, since it uses less digits than its factorization.

66411860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195355 (or 195353 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 66411860 is about 8149.3472131208. The cubic root of 66411860 is about 404.9628782721.

The spelling of 66411860 in words is "sixty-six million, four hundred eleven thousand, eight hundred sixty".