111616661212157 has 4 divisors (see below), whose sum is σ = 111621154480476. Its totient is φ = 111612167943840.

The previous prime is 111616661212141. The next prime is 111616661212211. The reversal of 111616661212157 is 751212166616111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12593882073796 + 99022779138361 = 3548786^2 + 9951019^2 .

It is a cyclic number.

It is not a de Polignac number, because 111616661212157 - 2⁴ = 111616661212141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111616661212117) 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, 2246596898 + ... + 2246646579.

It is an arithmetic number, because the mean of its divisors is an integer number (27905288620119).

Almost surely, 2^{111616661212157} is an apocalyptic number.

It is an amenable number.

111616661212157 is a deficient number, since it is larger than the sum of its proper divisors (4493268319).

111616661212157 is an equidigital number, since it uses as much as digits as its factorization.

111616661212157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493268318.

The product of its digits is 181440, while the sum is 47.

The spelling of 111616661212157 in words is "one hundred eleven trillion, six hundred sixteen billion, six hundred sixty-one million, two hundred twelve thousand, one hundred fifty-seven".