66405116 has 6 divisors (see below), whose sum is σ = 116208960. Its totient is φ = 33202556.

The previous prime is 66405083. The next prime is 66405127. The reversal of 66405116 is 61150466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8300636 + ... + 8300643.

It is an arithmetic number, because the mean of its divisors is an integer number (19368160).

Almost surely, 2^66405116 is an apocalyptic number.

It is an amenable number.

66405116 is a deficient number, since it is larger than the sum of its proper divisors (49803844).

66405116 is a wasteful number, since it uses less digits than its factorization.

66405116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16601283 (or 16601281 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66405116 is about 8148.9334271425. The cubic root of 66405116 is about 404.9491700675.

The spelling of 66405116 in words is "sixty-six million, four hundred five thousand, one hundred sixteen".