6997871637 has 10 divisors (see below), whose sum is σ = 10453610838. Its totient is φ = 4665247704.

The previous prime is 6997871623. The next prime is 6997871663. The reversal of 6997871637 is 7361787996.

It can be written as a sum of positive squares in only one way, i.e., 5782233681 + 1215637956 = 76041^2 + 34866^2 .

It is not a de Polignac number, because 6997871637 - 2¹⁰ = 6997870613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6997871737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43196658 + ... + 43196819.

Almost surely, 2^6997871637 is an apocalyptic number.

It is an amenable number.

6997871637 is a deficient number, since it is larger than the sum of its proper divisors (3455739201).

6997871637 is an equidigital number, since it uses as much as digits as its factorization.

6997871637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86393489 (or 86393480 counting only the distinct ones).

The product of its digits is 24004512, while the sum is 63.

The square root of 6997871637 is about 83653.2822846779. The cubic root of 6997871637 is about 1912.7372863600.

The spelling of 6997871637 in words is "six billion, nine hundred ninety-seven million, eight hundred seventy-one thousand, six hundred thirty-seven".