6638169797 has 6 divisors (see below), whose sum is σ = 7721952678. Its totient is φ = 5689859784.

The previous prime is 6638169761. The next prime is 6638169833. The reversal of 6638169797 is 7979618366.

It is an interprime number because it is at equal distance from previous prime (6638169761) and next prime (6638169833).

It can be written as a sum of positive squares in only one way, i.e., 5739729121 + 898440676 = 75761^2 + 29974^2 .

It is not a de Polignac number, because 6638169797 - 2¹⁴ = 6638153413 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 (6638169697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67736378 + ... + 67736475.

It is an arithmetic number, because the mean of its divisors is an integer number (1286992113).

Almost surely, 2^6638169797 is an apocalyptic number.

It is an amenable number.

6638169797 is a deficient number, since it is larger than the sum of its proper divisors (1083782881).

6638169797 is a wasteful number, since it uses less digits than its factorization.

6638169797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135472867 (or 135472860 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 62.

The square root of 6638169797 is about 81474.9642344199. The cubic root of 6638169797 is about 1879.3865696126.

The spelling of 6638169797 in words is "six billion, six hundred thirty-eight million, one hundred sixty-nine thousand, seven hundred ninety-seven".