6691672063 has 4 divisors (see below), whose sum is σ = 6696864720. Its totient is φ = 6686479408.

The previous prime is 6691672061. The next prime is 6691672067. The reversal of 6691672063 is 3602761966.

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 6691672063 - 2¹ = 6691672061 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 (6691672061) 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, 2594395 + ... + 2596972.

It is an arithmetic number, because the mean of its divisors is an integer number (1674216180).

Almost surely, 2^6691672063 is an apocalyptic number.

6691672063 is a deficient number, since it is larger than the sum of its proper divisors (5192657).

6691672063 is a wasteful number, since it uses less digits than its factorization.

6691672063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5192656.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 6691672063 is about 81802.6409292512. The cubic root of 6691672063 is about 1884.4222197566.

The spelling of 6691672063 in words is "six billion, six hundred ninety-one million, six hundred seventy-two thousand, sixty-three".