166555499231958 has 16 divisors (see below), whose sum is σ = 333499692754800. Its totient is φ = 55453717362176.

The previous prime is 166555499231929. The next prime is 166555499231983. The reversal of 166555499231958 is 859132994555661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16195589883 + ... + 16195600166.

It is an arithmetic number, because the mean of its divisors is an integer number (20843730797175).

Almost surely, 2^{166555499231958} is an apocalyptic number.

166555499231958 is an abundant number, since it is smaller than the sum of its proper divisors (166944193522842).

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

166555499231958 is a wasteful number, since it uses less digits than its factorization.

166555499231958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32391190911.

The product of its digits is 3149280000, while the sum is 78.

The spelling of 166555499231958 in words is "one hundred sixty-six trillion, five hundred fifty-five billion, four hundred ninety-nine million, two hundred thirty-one thousand, nine hundred fifty-eight".