66331590 has 32 divisors (see below), whose sum is σ = 171442656. Its totient is φ = 16327680.

The previous prime is 66331589. The next prime is 66331619. The reversal of 66331590 is 9513366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84651 + ... + 85430.

It is an arithmetic number, because the mean of its divisors is an integer number (5357583).

Almost surely, 2^66331590 is an apocalyptic number.

66331590 is an abundant number, since it is smaller than the sum of its proper divisors (105111066).

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

66331590 is a wasteful number, since it uses less digits than its factorization.

66331590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170104.

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 66331590 is about 8144.4207897186. The cubic root of 66331590 is about 404.7996570466.

The spelling of 66331590 in words is "sixty-six million, three hundred thirty-one thousand, five hundred ninety".