5661878534557 has 16 divisors (see below), whose sum is σ = 6478698840192. Its totient is φ = 4847054397120.

The previous prime is 5661878534509. The next prime is 5661878534567. The reversal of 5661878534557 is 7554358781665.

It is a cyclic number.

It is not a de Polignac number, because 5661878534557 - 2³⁵ = 5627518796189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661878534567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77382363 + ... + 77455495.

It is an arithmetic number, because the mean of its divisors is an integer number (404918677512).

Almost surely, 2^{5661878534557} is an apocalyptic number.

It is an amenable number.

5661878534557 is a deficient number, since it is larger than the sum of its proper divisors (816820305635).

5661878534557 is a wasteful number, since it uses less digits than its factorization.

5661878534557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86628.

The product of its digits is 846720000, while the sum is 70.

The spelling of 5661878534557 in words is "five trillion, six hundred sixty-one billion, eight hundred seventy-eight million, five hundred thirty-four thousand, five hundred fifty-seven".