166720356 has 144 divisors (see below), whose sum is σ = 493129728. Its totient is φ = 48794400.

The previous prime is 166720349. The next prime is 166720361. The reversal of 166720356 is 653027661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 166720356.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 331201 + ... + 331703.

It is an arithmetic number, because the mean of its divisors is an integer number (3424512).

Almost surely, 2^166720356 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 166720356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246564864).

166720356 is an abundant number, since it is smaller than the sum of its proper divisors (326409372).

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

166720356 is a wasteful number, since it uses less digits than its factorization.

166720356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 166720356 is about 12912.0236988630. The cubic root of 166720356 is about 550.3802945625.

The spelling of 166720356 in words is "one hundred sixty-six million, seven hundred twenty thousand, three hundred fifty-six".