99864266090521 has 9 divisors (see below), whose sum is σ = 100248060216031. Its totient is φ = 99481935830872.

The previous prime is 99864266090471. The next prime is 99864266090527. The reversal of 99864266090521 is 12509066246899.

The square root of 99864266090521 is 9993211.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 96105181055625 + 3759085034896 = 9803325^2 + 1938836^2 .

It is not a de Polignac number, because 99864266090521 - 2²⁹ = 99863729219609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99864266090527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2628195495 + ... + 2628233491.

Almost surely, 2^{99864266090521} is an apocalyptic number.

99864266090521 is the 9993211-st square number.

99864266090521 is the 4996606-th centered octagonal number.

It is an amenable number.

99864266090521 is a deficient number, since it is larger than the sum of its proper divisors (383794125510).

99864266090521 is an frugal number, since it uses more digits than its factorization.

99864266090521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76520 (or 38260 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 67.

The spelling of 99864266090521 in words is "ninety-nine trillion, eight hundred sixty-four billion, two hundred sixty-six million, ninety thousand, five hundred twenty-one".