99409724257 has 4 divisors (see below), whose sum is σ = 99432863236. Its totient is φ = 99386585280.

The previous prime is 99409724221. The next prime is 99409724303. The reversal of 99409724257 is 75242790499.

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 82898502241 + 16511222016 = 287921^2 + 128496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99409724257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99409724857) 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, 11563044 + ... + 11571637.

It is an arithmetic number, because the mean of its divisors is an integer number (24858215809).

Almost surely, 2^99409724257 is an apocalyptic number.

It is an amenable number.

99409724257 is a deficient number, since it is larger than the sum of its proper divisors (23138979).

99409724257 is a wasteful number, since it uses less digits than its factorization.

99409724257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23138978.

The product of its (nonzero) digits is 11430720, while the sum is 58.

The spelling of 99409724257 in words is "ninety-nine billion, four hundred nine million, seven hundred twenty-four thousand, two hundred fifty-seven".