166503790165 has 8 divisors (see below), whose sum is σ = 199811746008. Its totient is φ = 133198233600.

The previous prime is 166503790153. The next prime is 166503790177. The reversal of 166503790165 is 561097305661.

It is an interprime number because it is at equal distance from previous prime (166503790153) and next prime (166503790177).

It can be written as a sum of positive squares in 4 ways, for example, as 829555204 + 165674234961 = 28802^2 + 407031^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166503790165 - 2²¹ = 166501693013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443436 + ... + 727765.

It is an arithmetic number, because the mean of its divisors is an integer number (24976468251).

Almost surely, 2^166503790165 is an apocalyptic number.

It is an amenable number.

166503790165 is a deficient number, since it is larger than the sum of its proper divisors (33307955843).

166503790165 is a wasteful number, since it uses less digits than its factorization.

166503790165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199639.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The spelling of 166503790165 in words is "one hundred sixty-six billion, five hundred three million, seven hundred ninety thousand, one hundred sixty-five".