316521666 has 24 divisors (see below), whose sum is σ = 697422960. Its totient is φ = 103718616.

The previous prime is 316521629. The next prime is 316521679. The reversal of 316521666 is 666125613.

It is a self number, because there is not a number n which added to its sum of digits gives 316521666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147960 + ... + 150083.

It is an arithmetic number, because the mean of its divisors is an integer number (29059290).

Almost surely, 2^316521666 is an apocalyptic number.

316521666 is an abundant number, since it is smaller than the sum of its proper divisors (380901294).

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

316521666 is a wasteful number, since it uses less digits than its factorization.

316521666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298110 (or 298107 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 316521666 is about 17791.0557865462. The cubic root of 316521666 is about 681.5030664780.

The spelling of 316521666 in words is "three hundred sixteen million, five hundred twenty-one thousand, six hundred sixty-six".