99647923587 has 4 divisors (see below), whose sum is σ = 132863898120. Its totient is φ = 66431949056.

The previous prime is 99647923561. The next prime is 99647923597. The reversal of 99647923587 is 78532974699.

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

It is a cyclic number.

It is not a de Polignac number, because 99647923587 - 2²⁴ = 99631146371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99647923597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16607987262 + ... + 16607987267.

It is an arithmetic number, because the mean of its divisors is an integer number (33215974530).

Almost surely, 2^99647923587 is an apocalyptic number.

99647923587 is a deficient number, since it is larger than the sum of its proper divisors (33215974533).

99647923587 is a wasteful number, since it uses less digits than its factorization.

99647923587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33215974532.

The product of its digits is 205752960, while the sum is 69.

The spelling of 99647923587 in words is "ninety-nine billion, six hundred forty-seven million, nine hundred twenty-three thousand, five hundred eighty-seven".