66311408 has 20 divisors (see below), whose sum is σ = 129924720. Its totient is φ = 32782464.

The previous prime is 66311393. The next prime is 66311417. The reversal of 66311408 is 80411366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21860 + ... + 24707.

It is an arithmetic number, because the mean of its divisors is an integer number (6496236).

Almost surely, 2^66311408 is an apocalyptic number.

It is an amenable number.

66311408 is a deficient number, since it is larger than the sum of its proper divisors (63613312).

66311408 is a wasteful number, since it uses less digits than its factorization.

66311408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46664 (or 46658 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 66311408 is about 8143.1816877680. The cubic root of 66311408 is about 404.7585982018.

The spelling of 66311408 in words is "sixty-six million, three hundred eleven thousand, four hundred eight".