13658408642 has 18 divisors (see below), whose sum is σ = 21423070137. Its totient is φ = 6530464336.

The previous prime is 13658408641. The next prime is 13658408683. The reversal of 13658408642 is 24680485631.

It can be written as a sum of positive squares in 2 ways, for example, as 13187995921 + 470412721 = 114839^2 + 21689^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=82639.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13658408641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3799598 + ... + 3803190.

Almost surely, 2^13658408642 is an apocalyptic number.

13658408642 is a deficient number, since it is larger than the sum of its proper divisors (7764661495).

13658408642 is an frugal number, since it uses more digits than its factorization.

13658408642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7234 (or 3618 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 13658408642 in words is "thirteen billion, six hundred fifty-eight million, four hundred eight thousand, six hundred forty-two".