99725578101 has 6 divisors (see below), whose sum is σ = 144048057270. Its totient is φ = 66483718728.

The previous prime is 99725578067. The next prime is 99725578111. The reversal of 99725578101 is 10187552799.

99725578101 is a `hidden beast` number, since 9 + 9 + 7 + 2 + 557 + 81 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 95620100625 + 4105477476 = 309225^2 + 64074^2 .

It is not a de Polignac number, because 99725578101 - 2¹⁸ = 99725315957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99725578111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5540309886 + ... + 5540309903.

It is an arithmetic number, because the mean of its divisors is an integer number (24008009545).

Almost surely, 2^99725578101 is an apocalyptic number.

It is an amenable number.

99725578101 is a deficient number, since it is larger than the sum of its proper divisors (44322479169).

99725578101 is a wasteful number, since it uses less digits than its factorization.

99725578101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11080619795 (or 11080619792 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 54.

The spelling of 99725578101 in words is "ninety-nine billion, seven hundred twenty-five million, five hundred seventy-eight thousand, one hundred one".