99912998877722 has 4 divisors (see below), whose sum is σ = 149869498316586. Its totient is φ = 49956499438860.

The previous prime is 99912998877721. The next prime is 99912998877781. The reversal of 99912998877722 is 22777889921999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 56042127404641 + 43870871473081 = 7486129^2 + 6623509^2 .

It is not an unprimeable number, because it can be changed into a prime (99912998877721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24978249719429 + ... + 24978249719432.

Almost surely, 2^{99912998877722} is an apocalyptic number.

99912998877722 is a deficient number, since it is larger than the sum of its proper divisors (49956499438864).

99912998877722 is a wasteful number, since it uses less digits than its factorization.

99912998877722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49956499438863.

The product of its digits is 10369949184, while the sum is 89.

The spelling of 99912998877722 in words is "ninety-nine trillion, nine hundred twelve billion, nine hundred ninety-eight million, eight hundred seventy-seven thousand, seven hundred twenty-two".