6661560661011 has 96 divisors (see below), whose sum is σ = 10213296537600. Its totient is φ = 4177693739520.

The previous prime is 6661560661003. The next prime is 6661560661031. The reversal of 6661560661011 is 1101660651666.

It is not a de Polignac number, because 6661560661011 - 2³ = 6661560661003 is a prime.

It is a super-2 number, since 2×6661560661011² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6661560661001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1281806265 + ... + 1281811461.

It is an arithmetic number, because the mean of its divisors is an integer number (106388505600).

Almost surely, 2^{6661560661011} is an apocalyptic number.

6661560661011 is a deficient number, since it is larger than the sum of its proper divisors (3551735876589).

6661560661011 is a wasteful number, since it uses less digits than its factorization.

6661560661011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929 (or 5926 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 6661560661011 in words is "six trillion, six hundred sixty-one billion, five hundred sixty million, six hundred sixty-one thousand, eleven".