111920857993 has 8 divisors (see below), whose sum is σ = 130884193088. Its totient is φ = 93701183184.

The previous prime is 111920857981. The next prime is 111920858009. The reversal of 111920857993 is 399758029111.

It is a happy number.

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

It is not a de Polignac number, because 111920857993 - 2²¹ = 111918760841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111920857393) 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, 185914746 + ... + 185915347.

It is an arithmetic number, because the mean of its divisors is an integer number (16360524136).

Almost surely, 2^111920857993 is an apocalyptic number.

It is an amenable number.

111920857993 is a deficient number, since it is larger than the sum of its proper divisors (18963335095).

111920857993 is an equidigital number, since it uses as much as digits as its factorization.

111920857993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371830143.

The product of its (nonzero) digits is 1224720, while the sum is 55.

The spelling of 111920857993 in words is "one hundred eleven billion, nine hundred twenty million, eight hundred fifty-seven thousand, nine hundred ninety-three".