111660747251 has 4 divisors (see below), whose sum is σ = 113233433904. Its totient is φ = 110088060600.

The previous prime is 111660747179. The next prime is 111660747257. The reversal of 111660747251 is 152747066111.

It is a happy number.

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 111660747251 - 2¹⁸ = 111660485107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111660747199 and 111660747208.

It is not an unprimeable number, because it can be changed into a prime (111660747257) 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, 786343220 + ... + 786343361.

It is an arithmetic number, because the mean of its divisors is an integer number (28308358476).

Almost surely, 2^111660747251 is an apocalyptic number.

111660747251 is a deficient number, since it is larger than the sum of its proper divisors (1572686653).

111660747251 is an equidigital number, since it uses as much as digits as its factorization.

111660747251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572686652.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 111660747251 in words is "one hundred eleven billion, six hundred sixty million, seven hundred forty-seven thousand, two hundred fifty-one".