99721884181613 has 8 divisors (see below), whose sum is σ = 101412391688160. Its totient is φ = 98031386877840.

The previous prime is 99721884181609. The next prime is 99721884181643. The reversal of 99721884181613 is 31618148812799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99721884181613 - 2² = 99721884181609 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99721884181643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18643058 + ... + 23388188.

It is an arithmetic number, because the mean of its divisors is an integer number (12676548961020).

Almost surely, 2^{99721884181613} is an apocalyptic number.

It is an amenable number.

99721884181613 is a deficient number, since it is larger than the sum of its proper divisors (1690507506547).

99721884181613 is a wasteful number, since it uses less digits than its factorization.

99721884181613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101387.

The product of its digits is 41803776, while the sum is 68.

The spelling of 99721884181613 in words is "ninety-nine trillion, seven hundred twenty-one billion, eight hundred eighty-four million, one hundred eighty-one thousand, six hundred thirteen".