5661665156107 has 4 divisors (see below), whose sum is σ = 5754479339056. Its totient is φ = 5568850973160.

The previous prime is 5661665156087. The next prime is 5661665156113. The reversal of 5661665156107 is 7016515661665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5661665156107 - 2¹⁵ = 5661665123339 is a prime.

It is a super-2 number, since 2×5661665156107² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5661665156167) 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 3 ways as a sum of consecutive naturals, for example, 46407091383 + ... + 46407091504.

It is an arithmetic number, because the mean of its divisors is an integer number (1438619834764).

Almost surely, 2^{5661665156107} is an apocalyptic number.

5661665156107 is a deficient number, since it is larger than the sum of its proper divisors (92814182949).

5661665156107 is an equidigital number, since it uses as much as digits as its factorization.

5661665156107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92814182948.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 5661665156107 in words is "five trillion, six hundred sixty-one billion, six hundred sixty-five million, one hundred fifty-six thousand, one hundred seven".