2159253818 has 4 divisors (see below), whose sum is σ = 3238880730. Its totient is φ = 1079626908.

The previous prime is 2159253781. The next prime is 2159253821. The reversal of 2159253818 is 8183529512.

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

It can be written as a sum of positive squares in only one way, i.e., 1823887849 + 335365969 = 42707^2 + 18313^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539813453 + ... + 539813456.

Almost surely, 2^2159253818 is an apocalyptic number.

2159253818 is a deficient number, since it is larger than the sum of its proper divisors (1079626912).

2159253818 is a wasteful number, since it uses less digits than its factorization.

2159253818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079626911.

The product of its digits is 172800, while the sum is 44.

The square root of 2159253818 is about 46467.7718209083. The cubic root of 2159253818 is about 1292.5119449877.

The spelling of 2159253818 in words is "two billion, one hundred fifty-nine million, two hundred fifty-three thousand, eight hundred eighteen".