90734492165 has 4 divisors (see below), whose sum is σ = 108881390604. Its totient is φ = 72587593728.

The previous prime is 90734492161. The next prime is 90734492171. The reversal of 90734492165 is 56129443709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56129443709 = 116243 ⋅482863.

It can be written as a sum of positive squares in 2 ways, for example, as 61568000641 + 29166491524 = 248129^2 + 170782^2 .

It is a cyclic number.

It is not a de Polignac number, because 90734492165 - 2² = 90734492161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90734492161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9073449212 + ... + 9073449221.

It is an arithmetic number, because the mean of its divisors is an integer number (27220347651).

Almost surely, 2^90734492165 is an apocalyptic number.

It is an amenable number.

90734492165 is a deficient number, since it is larger than the sum of its proper divisors (18146898439).

90734492165 is a wasteful number, since it uses less digits than its factorization.

90734492165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18146898438.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 90734492165 in words is "ninety billion, seven hundred thirty-four million, four hundred ninety-two thousand, one hundred sixty-five".