166561254 has 24 divisors (see below), whose sum is σ = 361120032. Its totient is φ = 55483920.

The previous prime is 166561237. The next prime is 166561259. The reversal of 166561254 is 452165661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166561259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52884 + ... + 55944.

It is an arithmetic number, because the mean of its divisors is an integer number (15046668).

Almost surely, 2^166561254 is an apocalyptic number.

166561254 is an abundant number, since it is smaller than the sum of its proper divisors (194558778).

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

166561254 is a wasteful number, since it uses less digits than its factorization.

166561254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6092 (or 6089 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 166561254 is about 12905.8612265900. The cubic root of 166561254 is about 550.2051620281.

The spelling of 166561254 in words is "one hundred sixty-six million, five hundred sixty-one thousand, two hundred fifty-four".