90521886573621 has 6 divisors (see below), whose sum is σ = 130753836161910. Its totient is φ = 60347924382408.

The previous prime is 90521886573589. The next prime is 90521886573623. The reversal of 90521886573621 is 12637568812509.

90521886573621 is a `hidden beast` number, since 9 + 0 + 5 + 218 + 8 + 6 + 57 + 362 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 90127111860900 + 394774712721 = 9493530^2 + 628311^2 .

It is not a de Polignac number, because 90521886573621 - 2⁵ = 90521886573589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90521886573623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5028993698526 + ... + 5028993698543.

It is an arithmetic number, because the mean of its divisors is an integer number (21792306026985).

Almost surely, 2^{90521886573621} is an apocalyptic number.

It is an amenable number.

90521886573621 is a deficient number, since it is larger than the sum of its proper divisors (40231949588289).

90521886573621 is a wasteful number, since it uses less digits than its factorization.

90521886573621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10057987397075 (or 10057987397072 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 90521886573621 in words is "ninety trillion, five hundred twenty-one billion, eight hundred eighty-six million, five hundred seventy-three thousand, six hundred twenty-one".