215718966 has 12 divisors (see below), whose sum is σ = 467391132. Its totient is φ = 71906316.

The previous prime is 215718947. The next prime is 215718983. The reversal of 215718966 is 669817512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5992176 + ... + 5992211.

It is an arithmetic number, because the mean of its divisors is an integer number (38949261).

Almost surely, 2^215718966 is an apocalyptic number.

215718966 is an abundant number, since it is smaller than the sum of its proper divisors (251672166).

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

215718966 is a wasteful number, since it uses less digits than its factorization.

215718966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11984395 (or 11984392 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 215718966 is about 14687.3743739308. The cubic root of 215718966 is about 599.7396703972.

The spelling of 215718966 in words is "two hundred fifteen million, seven hundred eighteen thousand, nine hundred sixty-six".