1561551560079 has 32 divisors (see below), whose sum is σ = 2390467430400. Its totient is φ = 888213952512.

The previous prime is 1561551560071. The next prime is 1561551560131. The reversal of 1561551560079 is 9700651551651.

It is not a de Polignac number, because 1561551560079 - 2³ = 1561551560071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561551560071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4044202 + ... + 4413464.

It is an arithmetic number, because the mean of its divisors is an integer number (74702107200).

Almost surely, 2^{1561551560079} is an apocalyptic number.

1561551560079 is a deficient number, since it is larger than the sum of its proper divisors (828915870321).

1561551560079 is a wasteful number, since it uses less digits than its factorization.

1561551560079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370199.

The product of its (nonzero) digits is 1417500, while the sum is 51.

The spelling of 1561551560079 in words is "one trillion, five hundred sixty-one billion, five hundred fifty-one million, five hundred sixty thousand, seventy-nine".