2557211687 has 4 divisors (see below), whose sum is σ = 2557742616. Its totient is φ = 2556680760.

The previous prime is 2557211663. The next prime is 2557211693. The reversal of 2557211687 is 7861127552.

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

It is a cyclic number.

It is not a de Polignac number, because 2557211687 - 2⁶ = 2557211623 is a prime.

It is a super-2 number, since 2×2557211687² = 13078663224258771938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557211617) 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 3 ways as a sum of consecutive naturals, for example, 258173 + ... + 267894.

It is an arithmetic number, because the mean of its divisors is an integer number (639435654).

Almost surely, 2^2557211687 is an apocalyptic number.

2557211687 is a deficient number, since it is larger than the sum of its proper divisors (530929).

2557211687 is an equidigital number, since it uses as much as digits as its factorization.

2557211687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530928.

The product of its digits is 235200, while the sum is 44.

The square root of 2557211687 is about 50568.8806184199. The cubic root of 2557211687 is about 1367.4839156467.

The spelling of 2557211687 in words is "two billion, five hundred fifty-seven million, two hundred eleven thousand, six hundred eighty-seven".