2551171655 has 4 divisors (see below), whose sum is σ = 3061405992. Its totient is φ = 2040937320.

The previous prime is 2551171643. The next prime is 2551171669. The reversal of 2551171655 is 5561711552.

It is a happy number.

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

It is not a de Polignac number, because 2551171655 - 2²⁸ = 2282736199 is a prime.

It is a Duffinian number.

It is a congruent 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, 255117161 + ... + 255117170.

It is an arithmetic number, because the mean of its divisors is an integer number (765351498).

Almost surely, 2^2551171655 is an apocalyptic number.

2551171655 is a deficient number, since it is larger than the sum of its proper divisors (510234337).

2551171655 is an equidigital number, since it uses as much as digits as its factorization.

2551171655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510234336.

The product of its digits is 52500, while the sum is 38.

The square root of 2551171655 is about 50509.1244727128. The cubic root of 2551171655 is about 1366.4064193794.

The spelling of 2551171655 in words is "two billion, five hundred fifty-one million, one hundred seventy-one thousand, six hundred fifty-five".