13641857649 has 16 divisors (see below), whose sum is σ = 23097325440. Its totient is φ = 7795347120.

The previous prime is 13641857627. The next prime is 13641857653. The reversal of 13641857649 is 94675814631.

13641857649 is a `hidden beast` number, since 1 + 3 + 64 + 1 + 8 + 576 + 4 + 9 = 666.

It is not a de Polignac number, because 13641857649 - 2⁷ = 13641857521 is a prime.

It is a super-2 number, since 2×13641857649² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13641857595 and 13641857604.

It is not an unprimeable number, because it can be changed into a prime (13641856649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36089382 + ... + 36089759.

It is an arithmetic number, because the mean of its divisors is an integer number (1443582840).

Almost surely, 2^13641857649 is an apocalyptic number.

It is an amenable number.

13641857649 is a deficient number, since it is larger than the sum of its proper divisors (9455467791).

13641857649 is an equidigital number, since it uses as much as digits as its factorization.

13641857649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72179157 (or 72179151 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 13641857649 in words is "thirteen billion, six hundred forty-one million, eight hundred fifty-seven thousand, six hundred forty-nine".