6611887491 has 16 divisors (see below), whose sum is σ = 9622758528. Its totient is φ = 4004926400.

The previous prime is 6611887453. The next prime is 6611887511. The reversal of 6611887491 is 1947881166.

6611887491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6611887491 - 2⁷ = 6611887363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6611887411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2911 + ... + 115031.

It is an arithmetic number, because the mean of its divisors is an integer number (601422408).

Almost surely, 2^6611887491 is an apocalyptic number.

6611887491 is a deficient number, since it is larger than the sum of its proper divisors (3010871037).

6611887491 is a wasteful number, since it uses less digits than its factorization.

6611887491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113922.

The product of its digits is 580608, while the sum is 51.

The square root of 6611887491 is about 81313.5135816919. The cubic root of 6611887491 is about 1876.9029560533.

The spelling of 6611887491 in words is "six billion, six hundred eleven million, eight hundred eighty-seven thousand, four hundred ninety-one".