99535665987 has 12 divisors (see below), whose sum is σ = 143786409624. Its totient is φ = 66351263040.

The previous prime is 99535665961. The next prime is 99535665989. The reversal of 99535665987 is 78956653599.

99535665987 is a `hidden beast` number, since 9 + 9 + 5 + 3 + 566 + 59 + 8 + 7 = 666.

It is not a de Polignac number, because 99535665987 - 2²⁴ = 99518888771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99535665989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 378214 + ... + 584907.

It is an arithmetic number, because the mean of its divisors is an integer number (11982200802).

Almost surely, 2^99535665987 is an apocalyptic number.

99535665987 is a deficient number, since it is larger than the sum of its proper divisors (44250743637).

99535665987 is a wasteful number, since it uses less digits than its factorization.

99535665987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974610 (or 974607 counting only the distinct ones).

The product of its digits is 551124000, while the sum is 72.

The spelling of 99535665987 in words is "ninety-nine billion, five hundred thirty-five million, six hundred sixty-five thousand, nine hundred eighty-seven".