13642163641 has 4 divisors (see below), whose sum is σ = 13646515572. Its totient is φ = 13637811712.

The previous prime is 13642163629. The next prime is 13642163663. The reversal of 13642163641 is 14636124631.

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 11040755625 + 2601408016 = 105075^2 + 51004^2 .

It is a cyclic number.

It is not a de Polignac number, because 13642163641 - 2²⁹ = 13105292729 is a prime.

It is a super-2 number, since 2×13642163641² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13642163641.

It is not an unprimeable number, because it can be changed into a prime (13642163681) 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, 2171260 + ... + 2177533.

It is an arithmetic number, because the mean of its divisors is an integer number (3411628893).

Almost surely, 2^13642163641 is an apocalyptic number.

It is an amenable number.

13642163641 is a deficient number, since it is larger than the sum of its proper divisors (4351931).

13642163641 is an equidigital number, since it uses as much as digits as its factorization.

13642163641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351930.

The product of its digits is 62208, while the sum is 37.

The spelling of 13642163641 in words is "thirteen billion, six hundred forty-two million, one hundred sixty-three thousand, six hundred forty-one".