639880379775 has 480 divisors, whose sum is σ = 1545676070400. Its totient is φ = 254125900800.

The previous prime is 639880379773. The next prime is 639880379791. The reversal of 639880379775 is 577973088936.

639880379775 is a `hidden beast` number, since 6 + 398 + 80 + 3 + 7 + 97 + 75 = 666.

It is not a de Polignac number, because 639880379775 - 2¹ = 639880379773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639880379773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 626718765 + ... + 626719785.

It is an arithmetic number, because the mean of its divisors is an integer number (3220158480).

Almost surely, 2^639880379775 is an apocalyptic number.

639880379775 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

639880379775 is an abundant number, since it is smaller than the sum of its proper divisors (905795690625).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639880379775 is a wasteful number, since it uses less digits than its factorization.

639880379775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 480090240, while the sum is 72.

The spelling of 639880379775 in words is "six hundred thirty-nine billion, eight hundred eighty million, three hundred seventy-nine thousand, seven hundred seventy-five".