2156116357 has 4 divisors (see below), whose sum is σ = 2156297836. Its totient is φ = 2155934880.

The previous prime is 2156116337. The next prime is 2156116367. The reversal of 2156116357 is 7536116512.

It is a Cunningham number, because it is equal to 46434²+1.

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 1591531236 + 564585121 = 39894^2 + 23761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156116357 - 2⁷ = 2156116229 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 (2156116337) 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, 71568 + ... + 97129.

It is an arithmetic number, because the mean of its divisors is an integer number (539074459).

Almost surely, 2^2156116357 is an apocalyptic number.

It is an amenable number.

2156116357 is a deficient number, since it is larger than the sum of its proper divisors (181479).

2156116357 is a wasteful number, since it uses less digits than its factorization.

2156116357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181478.

The product of its digits is 37800, while the sum is 37.

The square root of 2156116357 is about 46434.0000107680. Note that the first 4 decimals coincide. The cubic root of 2156116357 is about 1291.8856219057.

The spelling of 2156116357 in words is "two billion, one hundred fifty-six million, one hundred sixteen thousand, three hundred fifty-seven".