164290617605 has 4 divisors (see below), whose sum is σ = 197148741132. Its totient is φ = 131432494080.

The previous prime is 164290617563. The next prime is 164290617653. The reversal of 164290617605 is 506716092461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506716092461 = 179 ⋅2830816159.

It can be written as a sum of positive squares in 2 ways, for example, as 63959421604 + 100331196001 = 252902^2 + 316751^2 .

It is not a de Polignac number, because 164290617605 - 2¹⁸ = 164290355461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 164290617605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16429061756 + ... + 16429061765.

It is an arithmetic number, because the mean of its divisors is an integer number (49287185283).

Almost surely, 2^164290617605 is an apocalyptic number.

It is an amenable number.

164290617605 is a deficient number, since it is larger than the sum of its proper divisors (32858123527).

164290617605 is an equidigital number, since it uses as much as digits as its factorization.

164290617605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32858123526.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 164290617605 in words is "one hundred sixty-four billion, two hundred ninety million, six hundred seventeen thousand, six hundred five".