6631913187 has 12 divisors (see below), whose sum is σ = 9603564880. Its totient is φ = 4410136368.

The previous prime is 6631913147. The next prime is 6631913209. The reversal of 6631913187 is 7813191366.

6631913187 is a `hidden beast` number, since 6 + 631 + 9 + 1 + 3 + 1 + 8 + 7 = 666.

It is not a de Polignac number, because 6631913187 - 2¹⁸ = 6631651043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6631913147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 924487 + ... + 931632.

Almost surely, 2^6631913187 is an apocalyptic number.

6631913187 is a deficient number, since it is larger than the sum of its proper divisors (2971651693).

6631913187 is a wasteful number, since it uses less digits than its factorization.

6631913187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856522 (or 1856519 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 6631913187 is about 81436.5592777593. The cubic root of 6631913187 is about 1878.7959306596.

The spelling of 6631913187 in words is "six billion, six hundred thirty-one million, nine hundred thirteen thousand, one hundred eighty-seven".