5665515051561 has 8 divisors (see below), whose sum is σ = 7554554242560. Its totient is φ = 3776742947472.

The previous prime is 5665515051551. The next prime is 5665515051569. The reversal of 5665515051561 is 1651505155665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5665515051561 - 2⁵ = 5665515051529 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (5665515051569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66722226 + ... + 66807083.

It is an arithmetic number, because the mean of its divisors is an integer number (944319280320).

Almost surely, 2^{5665515051561} is an apocalyptic number.

It is an amenable number.

5665515051561 is a deficient number, since it is larger than the sum of its proper divisors (1889039190999).

5665515051561 is a wasteful number, since it uses less digits than its factorization.

5665515051561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133543455.

The product of its (nonzero) digits is 3375000, while the sum is 51.

The spelling of 5665515051561 in words is "five trillion, six hundred sixty-five billion, five hundred fifteen million, fifty-one thousand, five hundred sixty-one".