111666512027 has 4 divisors (see below), whose sum is σ = 127618870896. Its totient is φ = 95714153160.

The previous prime is 111666512021. The next prime is 111666512051. The reversal of 111666512027 is 720215666111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111666512027 - 2⁴ = 111666512011 is a prime.

It is a super-2 number, since 2×111666512027² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111666512021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7976179424 + ... + 7976179437.

It is an arithmetic number, because the mean of its divisors is an integer number (31904717724).

Almost surely, 2^111666512027 is an apocalyptic number.

111666512027 is a deficient number, since it is larger than the sum of its proper divisors (15952358869).

111666512027 is an equidigital number, since it uses as much as digits as its factorization.

111666512027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15952358868.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 111666512027 in words is "one hundred eleven billion, six hundred sixty-six million, five hundred twelve thousand, twenty-seven".