166561430 has 16 divisors (see below), whose sum is σ = 342640800. Its totient is φ = 57106752.

The previous prime is 166561411. The next prime is 166561433. The reversal of 166561430 is 34165661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166561433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1189655 + ... + 1189794.

It is an arithmetic number, because the mean of its divisors is an integer number (21415050).

Almost surely, 2^166561430 is an apocalyptic number.

166561430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166561430 is an abundant number, since it is smaller than the sum of its proper divisors (176079370).

166561430 is a wasteful number, since it uses less digits than its factorization.

166561430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379463.

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

The square root of 166561430 is about 12905.8680451956. The cubic root of 166561430 is about 550.2053558228.

The spelling of 166561430 in words is "one hundred sixty-six million, five hundred sixty-one thousand, four hundred thirty".