99640555655247 has 12 divisors (see below), whose sum is σ = 152391438061200. Its totient is φ = 62519564332608.

The previous prime is 99640555655243. The next prime is 99640555655309. The reversal of 99640555655247 is 74255655504699.

99640555655247 is a `hidden beast` number, since 9 + 9 + 6 + 4 + 0 + 5 + 5 + 565 + 52 + 4 + 7 = 666.

It is not a de Polignac number, because 99640555655247 - 2² = 99640555655243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99640555655243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325622730747 + ... + 325622731052.

It is an arithmetic number, because the mean of its divisors is an integer number (12699286505100).

Almost surely, 2^{99640555655247} is an apocalyptic number.

99640555655247 is a deficient number, since it is larger than the sum of its proper divisors (52750882405953).

99640555655247 is a wasteful number, since it uses less digits than its factorization.

99640555655247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651245461822 (or 651245461819 counting only the distinct ones).

The product of its (nonzero) digits is 2041200000, while the sum is 72.

The spelling of 99640555655247 in words is "ninety-nine trillion, six hundred forty billion, five hundred fifty-five million, six hundred fifty-five thousand, two hundred forty-seven".