6639745748427 has 16 divisors (see below), whose sum is σ = 10730902220160. Its totient is φ = 4024088332200.

The previous prime is 6639745748417. The next prime is 6639745748479. The reversal of 6639745748427 is 7248475479366.

6639745748427 is a `hidden beast` number, since 6 + 6 + 3 + 9 + 7 + 4 + 574 + 8 + 42 + 7 = 666.

It is not a de Polignac number, because 6639745748427 - 2¹⁴ = 6639745732043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6639745748407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11178022849 + ... + 11178023442.

It is an arithmetic number, because the mean of its divisors is an integer number (670681388760).

Almost surely, 2^{6639745748427} is an apocalyptic number.

6639745748427 is a deficient number, since it is larger than the sum of its proper divisors (4091156471733).

6639745748427 is a wasteful number, since it uses less digits than its factorization.

6639745748427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22356046311 (or 22356046305 counting only the distinct ones).

The product of its digits is 1706987520, while the sum is 72.

The spelling of 6639745748427 in words is "six trillion, six hundred thirty-nine billion, seven hundred forty-five million, seven hundred forty-eight thousand, four hundred twenty-seven".