99899612761 has 27 divisors (see below), whose sum is σ = 111065388087. Its totient is φ = 89814167040.

The previous prime is 99899612749. The next prime is 99899612767. The reversal of 99899612761 is 16721699899.

The square root of 99899612761 is 316069.

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

It can be written as a sum of positive squares in 13 ways, for example, as 99615353161 + 284259600 = 315619^2 + 16860^2 .

It is not a de Polignac number, because 99899612761 - 2⁷ = 99899612633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99899612767) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 168464481 + ... + 168465073.

Almost surely, 2^99899612761 is an apocalyptic number.

99899612761 is the 316069-th square number.

99899612761 is the 158035-th centered octagonal number.

It is an amenable number.

99899612761 is a deficient number, since it is larger than the sum of its proper divisors (11165775326).

99899612761 is an frugal number, since it uses more digits than its factorization.

99899612761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 647 counting only the distinct ones).

The product of its digits is 26453952, while the sum is 67.

The spelling of 99899612761 in words is "ninety-nine billion, eight hundred ninety-nine million, six hundred twelve thousand, seven hundred sixty-one".