99539074781 has 16 divisors (see below), whose sum is σ = 109056767040. Its totient is φ = 90429991680.

The previous prime is 99539074717. The next prime is 99539074793. The reversal of 99539074781 is 18747093599.

It is a cyclic number.

It is not a de Polignac number, because 99539074781 - 2⁶ = 99539074717 is a prime.

It is a super-2 number, since 2×99539074781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99539074081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2052050 + ... + 2099996.

It is an arithmetic number, because the mean of its divisors is an integer number (6816047940).

Almost surely, 2^99539074781 is an apocalyptic number.

It is an amenable number.

99539074781 is a deficient number, since it is larger than the sum of its proper divisors (9517692259).

99539074781 is a wasteful number, since it uses less digits than its factorization.

99539074781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52204.

The product of its (nonzero) digits is 17146080, while the sum is 62.

The spelling of 99539074781 in words is "ninety-nine billion, five hundred thirty-nine million, seventy-four thousand, seven hundred eighty-one".