2156186493 has 16 divisors (see below), whose sum is σ = 3297395200. Its totient is φ = 1391087520.

The previous prime is 2156186491. The next prime is 2156186537. The reversal of 2156186493 is 3946816512.

2156186493 is a `hidden beast` number, since 2 + 1 + 561 + 86 + 4 + 9 + 3 = 666.

It is not a de Polignac number, because 2156186493 - 2¹ = 2156186491 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 (2156186491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1287208 + ... + 1288881.

It is an arithmetic number, because the mean of its divisors is an integer number (206087200).

Almost surely, 2^2156186493 is an apocalyptic number.

It is an amenable number.

2156186493 is a deficient number, since it is larger than the sum of its proper divisors (1141208707).

2156186493 is a wasteful number, since it uses less digits than its factorization.

2156186493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576129 (or 2576123 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 2156186493 is about 46434.7552270926. The cubic root of 2156186493 is about 1291.8996296079.

It can be divided in two parts, 215618 and 6493, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 2156186493 in words is "two billion, one hundred fifty-six million, one hundred eighty-six thousand, four hundred ninety-three".