639246842469 has 6 divisors (see below), whose sum is σ = 923356550246. Its totient is φ = 426164561640.

The previous prime is 639246842467. The next prime is 639246842543. The reversal of 639246842469 is 964248642936.

639246842469 is a `hidden beast` number, since 6 + 3 + 92 + 4 + 6 + 84 + 2 + 469 = 666.

It can be written as a sum of positive squares in only one way, i.e., 637541565444 + 1705277025 = 798462^2 + 41295^2 .

It is not a de Polignac number, because 639246842469 - 2¹ = 639246842467 is a prime.

It is a super-2 number, since 2×639246842469² (a number of 24 digits) 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 (639246842467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35513713462 + ... + 35513713479.

Almost surely, 2^639246842469 is an apocalyptic number.

It is an amenable number.

639246842469 is a deficient number, since it is larger than the sum of its proper divisors (284109707777).

639246842469 is a wasteful number, since it uses less digits than its factorization.

639246842469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71027426947 (or 71027426944 counting only the distinct ones).

The product of its digits is 107495424, while the sum is 63.

The spelling of 639246842469 in words is "six hundred thirty-nine billion, two hundred forty-six million, eight hundred forty-two thousand, four hundred sixty-nine".