1561110015500 has 96 divisors (see below), whose sum is σ = 4065945182208. Its totient is φ = 511966488000.

The previous prime is 1561110015499. The next prime is 1561110015527. The reversal of 1561110015500 is 55100111651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561110015500.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9615836 + ... + 9776835.

It is an arithmetic number, because the mean of its divisors is an integer number (42353595648).

Almost surely, 2^{1561110015500} is an apocalyptic number.

1561110015500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561110015500 is an abundant number, since it is smaller than the sum of its proper divisors (2504835166708).

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

1561110015500 is a wasteful number, since it uses less digits than its factorization.

1561110015500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19392720 (or 19392708 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 26.

The spelling of 1561110015500 in words is "one trillion, five hundred sixty-one billion, one hundred ten million, fifteen thousand, five hundred".