90164024681 has 4 divisors (see below), whose sum is σ = 91177103700. Its totient is φ = 89150945664.

The previous prime is 90164024659. The next prime is 90164024693. The reversal of 90164024681 is 18642046109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18642046109 = 151 ⋅123457259.

It can be written as a sum of positive squares in 2 ways, for example, as 7706030656 + 82457994025 = 87784^2 + 287155^2 .

It is a cyclic number.

It is not a de Polignac number, because 90164024681 - 2⁶ = 90164024617 is a prime.

It is a super-2 number, since 2×90164024681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90164024611) 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, 506539376 + ... + 506539553.

It is an arithmetic number, because the mean of its divisors is an integer number (22794275925).

Almost surely, 2^90164024681 is an apocalyptic number.

It is an amenable number.

90164024681 is a deficient number, since it is larger than the sum of its proper divisors (1013079019).

90164024681 is a wasteful number, since it uses less digits than its factorization.

90164024681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013079018.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 90164024681 in words is "ninety billion, one hundred sixty-four million, twenty-four thousand, six hundred eighty-one".