2155786359 has 4 divisors (see below), whose sum is σ = 2874381816. Its totient is φ = 1437190904.

The previous prime is 2155786349. The next prime is 2155786361. The reversal of 2155786359 is 9536875512.

It is a happy number.

2155786359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2155786359 - 2⁵ = 2155786327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155786349) 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, 359297724 + ... + 359297729.

It is an arithmetic number, because the mean of its divisors is an integer number (718595454).

Almost surely, 2^2155786359 is an apocalyptic number.

2155786359 is a deficient number, since it is larger than the sum of its proper divisors (718595457).

2155786359 is an equidigital number, since it uses as much as digits as its factorization.

2155786359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718595456.

The product of its digits is 2268000, while the sum is 51.

The square root of 2155786359 is about 46430.4464656544. The cubic root of 2155786359 is about 1291.8197099677.

The spelling of 2155786359 in words is "two billion, one hundred fifty-five million, seven hundred eighty-six thousand, three hundred fifty-nine".