99644906931 has 16 divisors (see below), whose sum is σ = 135966310656. Its totient is φ = 64877099616.

The previous prime is 99644906929. The next prime is 99644906951. The reversal of 99644906931 is 13960944699.

It is not a de Polignac number, because 99644906931 - 2¹ = 99644906929 is a prime.

It is a super-2 number, since 2×99644906931² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99644906951) 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, 1119826 + ... + 1205528.

It is an arithmetic number, because the mean of its divisors is an integer number (8497894416).

Almost surely, 2^99644906931 is an apocalyptic number.

99644906931 is a deficient number, since it is larger than the sum of its proper divisors (36321403725).

99644906931 is a wasteful number, since it uses less digits than its factorization.

99644906931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94762.

The product of its (nonzero) digits is 11337408, while the sum is 60.

The spelling of 99644906931 in words is "ninety-nine billion, six hundred forty-four million, nine hundred six thousand, nine hundred thirty-one".