99688745549 has 4 divisors (see below), whose sum is σ = 100416400764. Its totient is φ = 98961090336.

The previous prime is 99688745543. The next prime is 99688745551. The reversal of 99688745549 is 94554788699.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22735211524 + 76953534025 = 150782^2 + 277405^2 .

It is a cyclic number.

It is not a de Polignac number, because 99688745549 - 2⁸ = 99688745293 is a prime.

It is a super-2 number, since 2×99688745549² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99688745543) 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, 363827402 + ... + 363827675.

It is an arithmetic number, because the mean of its divisors is an integer number (25104100191).

Almost surely, 2^99688745549 is an apocalyptic number.

It is an amenable number.

99688745549 is a deficient number, since it is larger than the sum of its proper divisors (727655215).

99688745549 is a wasteful number, since it uses less digits than its factorization.

99688745549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727655214.

The product of its digits is 783820800, while the sum is 74.

The spelling of 99688745549 in words is "ninety-nine billion, six hundred eighty-eight million, seven hundred forty-five thousand, five hundred forty-nine".