15000055456861 has 2 divisors, whose sum is σ = 15000055456862. Its totient is φ = 15000055456860.

The previous prime is 15000055456723. The next prime is 15000055456877. The reversal of 15000055456861 is 16865455000051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14979454308900 + 20601147961 = 3870330^2 + 143531^2 .

It is a cyclic number.

It is not a de Polignac number, because 15000055456861 - 2⁹ = 15000055456349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15000055456891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7500027728430 + 7500027728431.

It is an arithmetic number, because the mean of its divisors is an integer number (7500027728431).

Almost surely, 2^{15000055456861} is an apocalyptic number.

It is an amenable number.

15000055456861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15000055456861 is an equidigital number, since it uses as much as digits as its factorization.

15000055456861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720000, while the sum is 46.

The spelling of 15000055456861 in words is "fifteen trillion, fifty-five million, four hundred fifty-six thousand, eight hundred sixty-one".