1561555112516 has 24 divisors (see below), whose sum is σ = 3186847171200. Its totient is φ = 669237904776.

The previous prime is 1561555112503. The next prime is 1561555112519. The reversal of 1561555112516 is 6152115551651.

It is not an unprimeable number, because it can be changed into a prime (1561555112519) 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, 569078480 + ... + 569081223.

It is an arithmetic number, because the mean of its divisors is an integer number (132785298800).

Almost surely, 2^{1561555112516} is an apocalyptic number.

It is an amenable number.

1561555112516 is an abundant number, since it is smaller than the sum of its proper divisors (1625292058684).

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

1561555112516 is a wasteful number, since it uses less digits than its factorization.

1561555112516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138159728 (or 1138159712 counting only the distinct ones).

The product of its digits is 225000, while the sum is 44.

The spelling of 1561555112516 in words is "one trillion, five hundred sixty-one billion, five hundred fifty-five million, one hundred twelve thousand, five hundred sixteen".