99601556823 has 32 divisors (see below), whose sum is σ = 149011441920. Its totient is φ = 65750136480.

The previous prime is 99601556807. The next prime is 99601556851. The reversal of 99601556823 is 32865510699.

It is a happy number.

99601556823 is a `hidden beast` number, since 9 + 9 + 6 + 0 + 1 + 556 + 82 + 3 = 666.

It is not a de Polignac number, because 99601556823 - 2⁴ = 99601556807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99601556823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99601556623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1077936 + ... + 1166682.

It is an arithmetic number, because the mean of its divisors is an integer number (4656607560).

Almost surely, 2^99601556823 is an apocalyptic number.

99601556823 is a deficient number, since it is larger than the sum of its proper divisors (49409885097).

99601556823 is a wasteful number, since it uses less digits than its factorization.

99601556823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89164 (or 89158 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 99601556823 in words is "ninety-nine billion, six hundred one million, five hundred fifty-six thousand, eight hundred twenty-three".