13561017220 has 24 divisors (see below), whose sum is σ = 28798119000. Its totient is φ = 5363457792.

The previous prime is 13561017179. The next prime is 13561017229. The reversal of 13561017220 is 2271016531.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2061886464 + 11499130756 = 45408^2 + 107234^2 .

It is a super-2 number, since 2×13561017220² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13561017229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3807495 + ... + 3811054.

It is an arithmetic number, because the mean of its divisors is an integer number (1199921625).

Almost surely, 2^13561017220 is an apocalyptic number.

13561017220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13561017220 is an abundant number, since it is smaller than the sum of its proper divisors (15237101780).

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

13561017220 is a wasteful number, since it uses less digits than its factorization.

13561017220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7618647 (or 7618645 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 13561017220 in words is "thirteen billion, five hundred sixty-one million, seventeen thousand, two hundred twenty".