99153981660591 has 192 divisors, whose sum is σ = 176001945584640. Its totient is φ = 54390292957440.

The previous prime is 99153981660527. The next prime is 99153981660593. The reversal of 99153981660591 is 19506618935199.

99153981660591 is a `hidden beast` number, since 9 + 9 + 1 + 5 + 3 + 9 + 8 + 1 + 6 + 605 + 9 + 1 = 666.

It is not a de Polignac number, because 99153981660591 - 2⁶ = 99153981660527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99153981660593) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5335726686 + ... + 5335745268.

It is an arithmetic number, because the mean of its divisors is an integer number (916676799920).

Almost surely, 2^{99153981660591} is an apocalyptic number.

99153981660591 is a deficient number, since it is larger than the sum of its proper divisors (76847963924049).

99153981660591 is a wasteful number, since it uses less digits than its factorization.

99153981660591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19131 (or 19066 counting only the distinct ones).

The product of its (nonzero) digits is 141717600, while the sum is 72.

The spelling of 99153981660591 in words is "ninety-nine trillion, one hundred fifty-three billion, nine hundred eighty-one million, six hundred sixty thousand, five hundred ninety-one".