164990637808591 has 32 divisors (see below), whose sum is σ = 191321682739200. Its totient is φ = 139352046593760.

The previous prime is 164990637808589. The next prime is 164990637808621. The reversal of 164990637808591 is 195808736099461.

It is not a de Polignac number, because 164990637808591 - 2¹ = 164990637808589 is a prime.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164990637808511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7902218490 + ... + 7902239368.

It is an arithmetic number, because the mean of its divisors is an integer number (5978802585600).

Almost surely, 2^{164990637808591} is an apocalyptic number.

164990637808591 is a deficient number, since it is larger than the sum of its proper divisors (26331044930609).

164990637808591 is a wasteful number, since it uses less digits than its factorization.

164990637808591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28939.

The product of its (nonzero) digits is 705438720, while the sum is 76.

The spelling of 164990637808591 in words is "one hundred sixty-four trillion, nine hundred ninety billion, six hundred thirty-seven million, eight hundred eight thousand, five hundred ninety-one".