166561650 has 48 divisors (see below), whose sum is σ = 458973600. Its totient is φ = 44416080.

The previous prime is 166561649. The next prime is 166561651. The reversal of 166561650 is 56165661.

166561650 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166561649) and next prime (166561651).

It is not an unprimeable number, because it can be changed into a prime (166561651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60340 + ... + 63039.

It is an arithmetic number, because the mean of its divisors is an integer number (9561950).

Almost surely, 2^166561650 is an apocalyptic number.

166561650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166561650 is an abundant number, since it is smaller than the sum of its proper divisors (292411950).

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

166561650 is a wasteful number, since it uses less digits than its factorization.

166561650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123400 (or 123389 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 166561650 is about 12905.8765684474. The cubic root of 166561650 is about 550.2055980660.

The spelling of 166561650 in words is "one hundred sixty-six million, five hundred sixty-one thousand, six hundred fifty".