13555561120 has 24 divisors (see below), whose sum is σ = 32025013524. Its totient is φ = 5422224384.

The previous prime is 13555561049. The next prime is 13555561121. The reversal of 13555561120 is 2116555531.

It can be written as a sum of positive squares in 2 ways, for example, as 11035922704 + 2519638416 = 105052^2 + 50196^2 .

It is not an unprimeable number, because it can be changed into a prime (13555561121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42360969 + ... + 42361288.

Almost surely, 2^13555561120 is an apocalyptic number.

13555561120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13555561120 is an abundant number, since it is smaller than the sum of its proper divisors (18469452404).

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

13555561120 is an equidigital number, since it uses as much as digits as its factorization.

13555561120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84722272 (or 84722264 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 13555561120 in words is "thirteen billion, five hundred fifty-five million, five hundred sixty-one thousand, one hundred twenty".