99938809161 has 27 divisors (see below), whose sum is σ = 145456157613. Its totient is φ = 66121959960.

The previous prime is 99938809123. The next prime is 99938809169. The reversal of 99938809161 is 16190883999.

The square root of 99938809161 is 316131.

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

99938809161 is a `hidden beast` number, since 9 + 99 + 388 + 0 + 9 + 161 = 666.

It is not a de Polignac number, because 99938809161 - 2²⁷ = 99804591433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99938809169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 158381316 + ... + 158381946.

Almost surely, 2^99938809161 is an apocalyptic number.

99938809161 is the 316131-st square number.

99938809161 is the 158066-th centered octagonal number.

It is an amenable number.

99938809161 is a deficient number, since it is larger than the sum of its proper divisors (45517348452).

99938809161 is an frugal number, since it uses more digits than its factorization.

99938809161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 63.

The spelling of 99938809161 in words is "ninety-nine billion, nine hundred thirty-eight million, eight hundred nine thousand, one hundred sixty-one".