561166621137 has 48 divisors (see below), whose sum is σ = 898044143360. Its totient is φ = 349130965392.

The previous prime is 561166621111. The next prime is 561166621153. The reversal of 561166621137 is 731126661165.

It is not a de Polignac number, because 561166621137 - 2¹⁸ = 561166358993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561166621092 and 561166621101.

It is not an unprimeable number, because it can be changed into a prime (561166621237) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 597703 + ... + 1216380.

Almost surely, 2^561166621137 is an apocalyptic number.

561166621137 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

It is an amenable number.

561166621137 is a deficient number, since it is larger than the sum of its proper divisors (336877522223).

561166621137 is a wasteful number, since it uses less digits than its factorization.

561166621137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814184 (or 1814172 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 561166621137 in words is "five hundred sixty-one billion, one hundred sixty-six million, six hundred twenty-one thousand, one hundred thirty-seven".