2155587687 has 32 divisors (see below), whose sum is σ = 3499234560. Its totient is φ = 1300620960.

The previous prime is 2155587673. The next prime is 2155587689. The reversal of 2155587687 is 7867855512.

2155587687 is a `hidden beast` number, since 2 + 1 + 5 + 558 + 7 + 6 + 87 = 666.

It is not a de Polignac number, because 2155587687 - 2⁸ = 2155587431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155587689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51433 + ... + 83405.

It is an arithmetic number, because the mean of its divisors is an integer number (109351080).

Almost surely, 2^2155587687 is an apocalyptic number.

2155587687 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2155587687 is a deficient number, since it is larger than the sum of its proper divisors (1343646873).

2155587687 is a wasteful number, since it uses less digits than its factorization.

2155587687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32220 (or 32214 counting only the distinct ones).

The product of its digits is 4704000, while the sum is 54.

The square root of 2155587687 is about 46428.3069581478. The cubic root of 2155587687 is about 1291.7800250999.

The spelling of 2155587687 in words is "two billion, one hundred fifty-five million, five hundred eighty-seven thousand, six hundred eighty-seven".