99138636657 has 12 divisors (see below), whose sum is σ = 143206548420. Its totient is φ = 66089518848.

The previous prime is 99138636643. The next prime is 99138636673. The reversal of 99138636657 is 75663683199.

99138636657 is a `hidden beast` number, since 99 + 138 + 6 + 366 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30440129841 + 68698506816 = 174471^2 + 262104^2 .

It is not a de Polignac number, because 99138636657 - 2⁷ = 99138636529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99138636594 and 99138636603.

It is not an unprimeable number, because it can be changed into a prime (99138636557) 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, 14808 + ... + 445529.

It is an arithmetic number, because the mean of its divisors is an integer number (11933879035).

Almost surely, 2^99138636657 is an apocalyptic number.

It is an amenable number.

99138636657 is a deficient number, since it is larger than the sum of its proper divisors (44067911763).

99138636657 is a wasteful number, since it uses less digits than its factorization.

99138636657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484272 (or 484269 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 63.

The spelling of 99138636657 in words is "ninety-nine billion, one hundred thirty-eight million, six hundred thirty-six thousand, six hundred fifty-seven".