2155813563 has 8 divisors (see below), whose sum is σ = 2967141376. Its totient is φ = 1390847400.

The previous prime is 2155813559. The next prime is 2155813573. The reversal of 2155813563 is 3653185512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2155813563 - 2² = 2155813559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155813523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11590303 + ... + 11590488.

It is an arithmetic number, because the mean of its divisors is an integer number (370892672).

Almost surely, 2^2155813563 is an apocalyptic number.

2155813563 is a deficient number, since it is larger than the sum of its proper divisors (811327813).

2155813563 is a wasteful number, since it uses less digits than its factorization.

2155813563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23180825.

The product of its digits is 108000, while the sum is 39.

The square root of 2155813563 is about 46430.7394190530. The cubic root of 2155813563 is about 1291.8251437955.

The spelling of 2155813563 in words is "two billion, one hundred fifty-five million, eight hundred thirteen thousand, five hundred sixty-three".