2158823551 has 4 divisors (see below), whose sum is σ = 2164706272. Its totient is φ = 2152940832.

The previous prime is 2158823543. The next prime is 2158823581. The reversal of 2158823551 is 1553288512.

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 2158823551 - 2³ = 2158823543 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 (2158823581) 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, 2940810 + ... + 2941543.

It is an arithmetic number, because the mean of its divisors is an integer number (541176568).

Almost surely, 2^2158823551 is an apocalyptic number.

2158823551 is a deficient number, since it is larger than the sum of its proper divisors (5882721).

2158823551 is an equidigital number, since it uses as much as digits as its factorization.

2158823551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882720.

The product of its digits is 96000, while the sum is 40.

The square root of 2158823551 is about 46463.1418545927. The cubic root of 2158823551 is about 1292.4260878310.

The spelling of 2158823551 in words is "two billion, one hundred fifty-eight million, eight hundred twenty-three thousand, five hundred fifty-one".