166864347438 has 32 divisors (see below), whose sum is σ = 334185778080. Its totient is φ = 55545323520.

The previous prime is 166864347427. The next prime is 166864347451. The reversal of 166864347438 is 834743468661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16212598 + ... + 16222886.

It is an arithmetic number, because the mean of its divisors is an integer number (10443305565).

Almost surely, 2^166864347438 is an apocalyptic number.

166864347438 is an abundant number, since it is smaller than the sum of its proper divisors (167321430642).

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

166864347438 is a wasteful number, since it uses less digits than its factorization.

166864347438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13732.

The product of its digits is 55738368, while the sum is 60.

The spelling of 166864347438 in words is "one hundred sixty-six billion, eight hundred sixty-four million, three hundred forty-seven thousand, four hundred thirty-eight".