111664427651 has 4 divisors (see below), whose sum is σ = 127616488752. Its totient is φ = 95712366552.

The previous prime is 111664427591. The next prime is 111664427653. The reversal of 111664427651 is 156724466111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111664427651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111664427653) 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, 7976030540 + ... + 7976030553.

It is an arithmetic number, because the mean of its divisors is an integer number (31904122188).

Almost surely, 2^111664427651 is an apocalyptic number.

111664427651 is a deficient number, since it is larger than the sum of its proper divisors (15952061101).

111664427651 is an equidigital number, since it uses as much as digits as its factorization.

111664427651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15952061100.

The product of its digits is 241920, while the sum is 44.

The spelling of 111664427651 in words is "one hundred eleven billion, six hundred sixty-four million, four hundred twenty-seven thousand, six hundred fifty-one".