2157855563 has 4 divisors (see below), whose sum is σ = 2157958440. Its totient is φ = 2157752688.

The previous prime is 2157855559. The next prime is 2157855617. The reversal of 2157855563 is 3655587512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2157855563 - 2² = 2157855559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157854563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7418 + ... + 66111.

It is an arithmetic number, because the mean of its divisors is an integer number (539489610).

Almost surely, 2^2157855563 is an apocalyptic number.

2157855563 is a deficient number, since it is larger than the sum of its proper divisors (102877).

2157855563 is an equidigital number, since it uses as much as digits as its factorization.

2157855563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102876.

The product of its digits is 1260000, while the sum is 47.

The square root of 2157855563 is about 46452.7239567283. The cubic root of 2157855563 is about 1292.2328900166.

The spelling of 2157855563 in words is "two billion, one hundred fifty-seven million, eight hundred fifty-five thousand, five hundred sixty-three".