12161057643 has 24 divisors (see below), whose sum is σ = 20115680000. Its totient is φ = 6935231664.

The previous prime is 12161057609. The next prime is 12161057687. The reversal of 12161057643 is 34675016121.

12161057643 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 1 + 0 + 5 + 7 + 643 = 666.

It is not a de Polignac number, because 12161057643 - 2⁸ = 12161057387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12161057598 and 12161057607.

It is not an unprimeable number, because it can be changed into a prime (12161057603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161983 + ... + 224856.

Almost surely, 2^12161057643 is an apocalyptic number.

12161057643 is a deficient number, since it is larger than the sum of its proper divisors (7954622357).

12161057643 is a wasteful number, since it uses less digits than its factorization.

12161057643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387351 (or 387348 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 12161057643 in words is "twelve billion, one hundred sixty-one million, fifty-seven thousand, six hundred forty-three".