90158715522 has 90 divisors (see below), whose sum is σ = 209024046297. Its totient is φ = 29045239200.

The previous prime is 90158715509. The next prime is 90158715523. The reversal of 90158715522 is 22551785109.

90158715522 is a `hidden beast` number, since 9 + 0 + 1 + 58 + 71 + 5 + 522 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49693772241 + 40464943281 = 222921^2 + 201159^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=212319.

It is not an unprimeable number, because it can be changed into a prime (90158715523) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 118473622 + ... + 118474382.

Almost surely, 2^90158715522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90158715522

90158715522 is an abundant number, since it is smaller than the sum of its proper divisors (118865330775).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90158715522 is an frugal number, since it uses more digits than its factorization.

90158715522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 45.

The spelling of 90158715522 in words is "ninety billion, one hundred fifty-eight million, seven hundred fifteen thousand, five hundred twenty-two".