6571161887 has 4 divisors (see below), whose sum is σ = 6571387680. Its totient is φ = 6570936096.

The previous prime is 6571161851. The next prime is 6571161923. The reversal of 6571161887 is 7881611756.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (6571161851) and next prime (6571161923).

It is a cyclic number.

It is not a de Polignac number, because 6571161887 - 2²⁰ = 6570113311 is a prime.

It is a super-2 number, since 2×6571161887² = 86360337090322801538, 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 (6571161587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61418 + ... + 130055.

It is an arithmetic number, because the mean of its divisors is an integer number (1642846920).

Almost surely, 2^6571161887 is an apocalyptic number.

6571161887 is a deficient number, since it is larger than the sum of its proper divisors (225793).

6571161887 is a wasteful number, since it uses less digits than its factorization.

6571161887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225792.

The product of its digits is 564480, while the sum is 50.

The square root of 6571161887 is about 81062.7034276553. The cubic root of 6571161887 is about 1873.0414523283.

The spelling of 6571161887 in words is "six billion, five hundred seventy-one million, one hundred sixty-one thousand, eight hundred eighty-seven".