12621161853 has 80 divisors (see below), whose sum is σ = 19591963776. Its totient is φ = 8093675520.

The previous prime is 12621161831. The next prime is 12621161869. The reversal of 12621161853 is 35816112621.

12621161853 is a `hidden beast` number, since 1 + 2 + 621 + 16 + 18 + 5 + 3 = 666.

It is not a de Polignac number, because 12621161853 - 2⁵ = 12621161821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621161153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 65394525 + ... + 65394717.

Almost surely, 2^12621161853 is an apocalyptic number.

It is an amenable number.

12621161853 is a deficient number, since it is larger than the sum of its proper divisors (6970801923).

12621161853 is a wasteful number, since it uses less digits than its factorization.

12621161853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 487 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 12621161853 in words is "twelve billion, six hundred twenty-one million, one hundred sixty-one thousand, eight hundred fifty-three".