15155515561 has 8 divisors (see below), whose sum is σ = 15590131200. Its totient is φ = 14723993760.

The previous prime is 15155515553. The next prime is 15155515567. The reversal of 15155515561 is 16551555151.

It is a happy number.

15155515561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15155515561 - 2³ = 15155515553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15155515567) 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 7 ways as a sum of consecutive naturals, for example, 763521 + ... + 783118.

It is an arithmetic number, because the mean of its divisors is an integer number (1948766400).

Almost surely, 2^15155515561 is an apocalyptic number.

It is an amenable number.

15155515561 is a deficient number, since it is larger than the sum of its proper divisors (434615639).

15155515561 is a wasteful number, since it uses less digits than its factorization.

15155515561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546919.

The product of its digits is 93750, while the sum is 40.

The spelling of 15155515561 in words is "fifteen billion, one hundred fifty-five million, five hundred fifteen thousand, five hundred sixty-one".