1561551106116 has 24 divisors (see below), whose sum is σ = 3648112019104. Its totient is φ = 519875210880.

The previous prime is 1561551106069. The next prime is 1561551106147. The reversal of 1561551106116 is 6116011551651.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80217925 + ... + 80237388.

Almost surely, 2^{1561551106116} is an apocalyptic number.

It is an amenable number.

1561551106116 is an abundant number, since it is smaller than the sum of its proper divisors (2086560912988).

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

1561551106116 is a wasteful number, since it uses less digits than its factorization.

1561551106116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160456131 (or 160456129 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 39.

Adding to 1561551106116 its reverse (6116011551651), we get a palindrome (7677562657767).

The spelling of 1561551106116 in words is "one trillion, five hundred sixty-one billion, five hundred fifty-one million, one hundred six thousand, one hundred sixteen".