2117654155 has 4 divisors (see below), whose sum is σ = 2541184992. Its totient is φ = 1694123320.

The previous prime is 2117654117. The next prime is 2117654213. The reversal of 2117654155 is 5514567112.

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

It is not a de Polignac number, because 2117654155 - 2²³ = 2109265547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211765411 + ... + 211765420.

It is an arithmetic number, because the mean of its divisors is an integer number (635296248).

Almost surely, 2^2117654155 is an apocalyptic number.

2117654155 is a deficient number, since it is larger than the sum of its proper divisors (423530837).

2117654155 is an equidigital number, since it uses as much as digits as its factorization.

2117654155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423530836.

The product of its digits is 42000, while the sum is 37.

The square root of 2117654155 is about 46017.9764331288. The cubic root of 2117654155 is about 1284.1576547310.

The spelling of 2117654155 in words is "two billion, one hundred seventeen million, six hundred fifty-four thousand, one hundred fifty-five".