111813861561 has 8 divisors (see below), whose sum is σ = 149146084224. Its totient is φ = 74512106640.

The previous prime is 111813861517. The next prime is 111813861563. The reversal of 111813861561 is 165168318111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111813861561 - 2⁷ = 111813861433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111813861563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7608370 + ... + 7623051.

It is an arithmetic number, because the mean of its divisors is an integer number (18643260528).

Almost surely, 2^111813861561 is an apocalyptic number.

It is an amenable number.

111813861561 is a deficient number, since it is larger than the sum of its proper divisors (37332222663).

111813861561 is a wasteful number, since it uses less digits than its factorization.

111813861561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15233871.

The product of its digits is 34560, while the sum is 42.

The spelling of 111813861561 in words is "one hundred eleven billion, eight hundred thirteen million, eight hundred sixty-one thousand, five hundred sixty-one".