1561013806860 has 192 divisors, whose sum is σ = 5142953088000. Its totient is φ = 391723674624.

The previous prime is 1561013806817. The next prime is 1561013806861. The reversal of 1561013806860 is 686083101651.

1561013806860 is a `hidden beast` number, since 1 + 56 + 101 + 380 + 68 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1561013806861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 113118241 + ... + 113132039.

It is an arithmetic number, because the mean of its divisors is an integer number (26786214000).

Almost surely, 2^{1561013806860} is an apocalyptic number.

1561013806860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561013806860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2571476544000).

1561013806860 is an abundant number, since it is smaller than the sum of its proper divisors (3581939281140).

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

1561013806860 is a wasteful number, since it uses less digits than its factorization.

1561013806860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26157 (or 26149 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 1561013806860 in words is "one trillion, five hundred sixty-one billion, thirteen million, eight hundred six thousand, eight hundred sixty".