15105105561 has 32 divisors (see below), whose sum is σ = 25642632960. Its totient is φ = 7692781824.

The previous prime is 15105105527. The next prime is 15105105571. The reversal of 15105105561 is 16550150151.

15105105561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15105105561 - 2²¹ = 15103008409 is a prime.

It is a super-3 number, since 3×15105105561³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (15105105571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 946050 + ... + 961883.

It is an arithmetic number, because the mean of its divisors is an integer number (801332280).

Almost surely, 2^15105105561 is an apocalyptic number.

It is an amenable number.

15105105561 is a deficient number, since it is larger than the sum of its proper divisors (10537527399).

15105105561 is a wasteful number, since it uses less digits than its factorization.

15105105561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907985.

The product of its (nonzero) digits is 3750, while the sum is 30.

The spelling of 15105105561 in words is "fifteen billion, one hundred five million, one hundred five thousand, five hundred sixty-one".