99623721355 has 16 divisors (see below), whose sum is σ = 122344516800. Its totient is φ = 77855541120.

The previous prime is 99623721349. The next prime is 99623721359. The reversal of 99623721355 is 55312732699.

It is not a de Polignac number, because 99623721355 - 2⁹ = 99623720843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99623721359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1248600 + ... + 1325989.

It is an arithmetic number, because the mean of its divisors is an integer number (7646532300).

Almost surely, 2^99623721355 is an apocalyptic number.

99623721355 is a deficient number, since it is larger than the sum of its proper divisors (22720795445).

99623721355 is a wasteful number, since it uses less digits than its factorization.

99623721355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574774.

The product of its digits is 3061800, while the sum is 52.

The spelling of 99623721355 in words is "ninety-nine billion, six hundred twenty-three million, seven hundred twenty-one thousand, three hundred fifty-five".