15561001120 has 48 divisors (see below), whose sum is σ = 42014706048. Its totient is φ = 5335200000.

The previous prime is 15561001117. The next prime is 15561001147. The reversal of 15561001120 is 2110016551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 15561001091 and 15561001100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6945756 + ... + 6947995.

It is an arithmetic number, because the mean of its divisors is an integer number (875306376).

Almost surely, 2^15561001120 is an apocalyptic number.

15561001120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15561001120 is an abundant number, since it is smaller than the sum of its proper divisors (26453704928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15561001120 is a wasteful number, since it uses less digits than its factorization.

15561001120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13893773 (or 13893765 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

Adding to 15561001120 its reverse (2110016551), we get a palindrome (17671017671).

The spelling of 15561001120 in words is "fifteen billion, five hundred sixty-one million, one thousand, one hundred twenty".