111660066561 has 16 divisors (see below), whose sum is σ = 153896509440. Its totient is φ = 71938516560.

The previous prime is 111660066527. The next prime is 111660066613. The reversal of 111660066561 is 165660066111.

It is a de Polignac number, because none of the positive numbers 2^k-111660066561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111660066061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 768075 + ... + 901808.

It is an arithmetic number, because the mean of its divisors is an integer number (9618531840).

Almost surely, 2^111660066561 is an apocalyptic number.

It is an amenable number.

111660066561 is a deficient number, since it is larger than the sum of its proper divisors (42236442879).

111660066561 is a wasteful number, since it uses less digits than its factorization.

111660066561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670636.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 111660066561 in words is "one hundred eleven billion, six hundred sixty million, sixty-six thousand, five hundred sixty-one".