561486128877 has 20 divisors (see below), whose sum is σ = 848868820800. Its totient is φ = 369814152744.

The previous prime is 561486128849. The next prime is 561486128881. The reversal of 561486128877 is 778821684165.

It is a happy number.

561486128877 is a `hidden beast` number, since 5 + 6 + 1 + 4 + 8 + 612 + 8 + 8 + 7 + 7 = 666.

It is not a de Polignac number, because 561486128877 - 2¹⁴ = 561486112493 is a prime.

It is a super-2 number, since 2×561486128877² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561486108877) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41751877 + ... + 41765322.

It is an arithmetic number, because the mean of its divisors is an integer number (42443441040).

Almost surely, 2^561486128877 is an apocalyptic number.

It is an amenable number.

561486128877 is a deficient number, since it is larger than the sum of its proper divisors (287382691923).

561486128877 is an equidigital number, since it uses as much as digits as its factorization.

561486128877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83517294 (or 83517285 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 63.

The spelling of 561486128877 in words is "five hundred sixty-one billion, four hundred eighty-six million, one hundred twenty-eight thousand, eight hundred seventy-seven".