6635865671 has 4 divisors (see below), whose sum is σ = 6636981144. Its totient is φ = 6634750200.

The previous prime is 6635865659. The next prime is 6635865679. The reversal of 6635865671 is 1765685366.

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 6635865671 - 2¹⁰ = 6635864647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6635865679) 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, 548765 + ... + 560726.

It is an arithmetic number, because the mean of its divisors is an integer number (1659245286).

Almost surely, 2^6635865671 is an apocalyptic number.

6635865671 is a deficient number, since it is larger than the sum of its proper divisors (1115473).

6635865671 is a wasteful number, since it uses less digits than its factorization.

6635865671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115472.

The product of its digits is 5443200, while the sum is 53.

The square root of 6635865671 is about 81460.8229212055. The cubic root of 6635865671 is about 1879.1690977937.

The spelling of 6635865671 in words is "six billion, six hundred thirty-five million, eight hundred sixty-five thousand, six hundred seventy-one".