5665515081561 has 24 divisors (see below), whose sum is σ = 8671788084960. Its totient is φ = 3552009334656.

The previous prime is 5665515081521. The next prime is 5665515081563. The reversal of 5665515081561 is 1651805155665.

5665515081561 is a `hidden beast` number, since 5 + 6 + 6 + 551 + 5 + 0 + 81 + 5 + 6 + 1 = 666.

It is not a de Polignac number, because 5665515081561 - 2⁹ = 5665515081049 is a prime.

It is a super-2 number, since 2×5665515081561² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 5665515081498 and 5665515081507.

It is not an unprimeable number, because it can be changed into a prime (5665515081563) 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, 14513295 + ... + 14898548.

It is an arithmetic number, because the mean of its divisors is an integer number (361324503540).

Almost surely, 2^{5665515081561} is an apocalyptic number.

5665515081561 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5665515081561 is a deficient number, since it is larger than the sum of its proper divisors (3006273003399).

5665515081561 is a wasteful number, since it uses less digits than its factorization.

5665515081561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29413125 (or 29413122 counting only the distinct ones).

The product of its (nonzero) digits is 5400000, while the sum is 54.

The spelling of 5665515081561 in words is "five trillion, six hundred sixty-five billion, five hundred fifteen million, eighty-one thousand, five hundred sixty-one".