166520660 has 12 divisors (see below), whose sum is σ = 349693428. Its totient is φ = 66608256.

The previous prime is 166520603. The next prime is 166520663. The reversal of 166520660 is 66025661.

It can be written as a sum of positive squares in 2 ways, for example, as 104489284 + 62031376 = 10222^2 + 7876^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166520663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4162997 + ... + 4163036.

It is an arithmetic number, because the mean of its divisors is an integer number (29141119).

Almost surely, 2^166520660 is an apocalyptic number.

166520660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166520660 is an abundant number, since it is smaller than the sum of its proper divisors (183172768).

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

166520660 is a wasteful number, since it uses less digits than its factorization.

166520660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8326042 (or 8326040 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 166520660 is about 12904.2884344701. The cubic root of 166520660 is about 550.1604600690.

The spelling of 166520660 in words is "one hundred sixty-six million, five hundred twenty thousand, six hundred sixty".