15056555561 has 2 divisors, whose sum is σ = 15056555562. Its totient is φ = 15056555560.

The previous prime is 15056555543. The next prime is 15056555587. The reversal of 15056555561 is 16555565051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10705833961 + 4350721600 = 103469^2 + 65960^2 .

It is a cyclic number.

It is not a de Polignac number, because 15056555561 - 2⁶ = 15056555497 is a prime.

It is a super-2 number, since 2×15056555561² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15056551561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7528277780 + 7528277781.

It is an arithmetic number, because the mean of its divisors is an integer number (7528277781).

Almost surely, 2^15056555561 is an apocalyptic number.

It is an amenable number.

15056555561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15056555561 is an equidigital number, since it uses as much as digits as its factorization.

15056555561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 562500, while the sum is 44.

The spelling of 15056555561 in words is "fifteen billion, fifty-six million, five hundred fifty-five thousand, five hundred sixty-one".