166318956 has 72 divisors (see below), whose sum is σ = 446977440. Its totient is φ = 51964416.

The previous prime is 166318949. The next prime is 166318963. The reversal of 166318956 is 659813661.

166318956 is a `hidden beast` number, since 1 + 6 + 631 + 8 + 9 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (166318949) and next prime (166318963).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219330 + ... + 220086.

It is an arithmetic number, because the mean of its divisors is an integer number (6208020).

Almost surely, 2^166318956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166318956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223488720).

166318956 is an abundant number, since it is smaller than the sum of its proper divisors (280658484).

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

166318956 is a wasteful number, since it uses less digits than its factorization.

166318956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1138 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 166318956 is about 12896.4706799961. The cubic root of 166318956 is about 549.9382365906.

The spelling of 166318956 in words is "one hundred sixty-six million, three hundred eighteen thousand, nine hundred fifty-six".