13956791643 has 32 divisors (see below), whose sum is σ = 21076776000. Its totient is φ = 9125395200.

The previous prime is 13956791627. The next prime is 13956791657. The reversal of 13956791643 is 34619765931.

13956791643 is a `hidden beast` number, since 1 + 39 + 567 + 9 + 1 + 6 + 43 = 666.

It is not a de Polignac number, because 13956791643 - 2⁴ = 13956791627 is a prime.

It is a super-2 number, since 2×13956791643² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13956791643.

It is not an unprimeable number, because it can be changed into a prime (13956791603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 562663 + ... + 586943.

It is an arithmetic number, because the mean of its divisors is an integer number (658649250).

Almost surely, 2^13956791643 is an apocalyptic number.

13956791643 is a deficient number, since it is larger than the sum of its proper divisors (7119984357).

13956791643 is a wasteful number, since it uses less digits than its factorization.

13956791643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24700 (or 24694 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The spelling of 13956791643 in words is "thirteen billion, nine hundred fifty-six million, seven hundred ninety-one thousand, six hundred forty-three".