55116006561561 has 16 divisors (see below), whose sum is σ = 84884544865728. Its totient is φ = 31438720320000.

The previous prime is 55116006561541. The next prime is 55116006561611. The reversal of 55116006561561 is 16516560061155.

It is not a de Polignac number, because 55116006561561 - 2⁵ = 55116006561529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55116006561561.

It is not an unprimeable number, because it can be changed into a prime (55116006561541) 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, 49122999940 + ... + 49123001061.

It is an arithmetic number, because the mean of its divisors is an integer number (5305284054108).

Almost surely, 2^{55116006561561} is an apocalyptic number.

55116006561561 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55116006561561 is a deficient number, since it is larger than the sum of its proper divisors (29768538304167).

55116006561561 is a wasteful number, since it uses less digits than its factorization.

55116006561561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98246001032.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 55116006561561 in words is "fifty-five trillion, one hundred sixteen billion, six million, five hundred sixty-one thousand, five hundred sixty-one".