66711790 has 16 divisors (see below), whose sum is σ = 120174912. Its totient is φ = 26663904.

The previous prime is 66711781. The next prime is 66711817. The reversal of 66711790 is 9711766.

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, 21412 + ... + 24328.

It is an arithmetic number, because the mean of its divisors is an integer number (7510932).

Almost surely, 2^66711790 is an apocalyptic number.

66711790 is a deficient number, since it is larger than the sum of its proper divisors (53463122).

66711790 is a wasteful number, since it uses less digits than its factorization.

66711790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5211.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 66711790 is about 8167.7285704166. The cubic root of 66711790 is about 405.5715954819.

The spelling of 66711790 in words is "sixty-six million, seven hundred eleven thousand, seven hundred ninety".