661560055110 has 96 divisors (see below), whose sum is σ = 1758370498560. Its totient is φ = 172517659200.

The previous prime is 661560055099. The next prime is 661560055133. The reversal of 661560055110 is 11550065166.

It is a super-2 number, since 2×661560055110² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 688065 + ... + 1340355.

It is an arithmetic number, because the mean of its divisors is an integer number (18316359360).

Almost surely, 2^661560055110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661560055110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (879185249280).

661560055110 is an abundant number, since it is smaller than the sum of its proper divisors (1096810443450).

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

661560055110 is a wasteful number, since it uses less digits than its factorization.

661560055110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652554 (or 652551 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 661560055110 in words is "six hundred sixty-one billion, five hundred sixty million, fifty-five thousand, one hundred ten".