13609490157 has 20 divisors (see below), whose sum is σ = 20417508540. Its totient is φ = 9034041024.

The previous prime is 13609490143. The next prime is 13609490159. The reversal of 13609490157 is 75109490631.

13609490157 is a `hidden beast` number, since 1 + 3 + 6 + 0 + 9 + 490 + 157 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1303137801 + 12306352356 = 36099^2 + 110934^2 .

It is not a de Polignac number, because 13609490157 - 2¹⁰ = 13609489133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13609490159) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 341682 + ... + 379427.

It is an arithmetic number, because the mean of its divisors is an integer number (1020875427).

Almost surely, 2^13609490157 is an apocalyptic number.

It is an amenable number.

13609490157 is a deficient number, since it is larger than the sum of its proper divisors (6808018383).

13609490157 is an equidigital number, since it uses as much as digits as its factorization.

13609490157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721354 (or 721345 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 13609490157 in words is "thirteen billion, six hundred nine million, four hundred ninety thousand, one hundred fifty-seven".