166585794438 has 16 divisors (see below), whose sum is σ = 380767530240. Its totient is φ = 47595941256.

The previous prime is 166585794433. The next prime is 166585794451. The reversal of 166585794438 is 834497585661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166585794433) 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, 1983164178 + ... + 1983164261.

It is an arithmetic number, because the mean of its divisors is an integer number (23797970640).

Almost surely, 2^166585794438 is an apocalyptic number.

166585794438 is an abundant number, since it is smaller than the sum of its proper divisors (214181735802).

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

166585794438 is a wasteful number, since it uses less digits than its factorization.

166585794438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966328451.

The product of its digits is 174182400, while the sum is 66.

The spelling of 166585794438 in words is "one hundred sixty-six billion, five hundred eighty-five million, seven hundred ninety-four thousand, four hundred thirty-eight".