639919059970246 has 24 divisors (see below), whose sum is σ = 1116604481252760. Its totient is φ = 274248319165632.

The previous prime is 639919059970181. The next prime is 639919059970247. The reversal of 639919059970246 is 642079950919936.

It is a Smith number, since the sum of its digits (79) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639919059970247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22224000 + ... + 42115843.

It is an arithmetic number, because the mean of its divisors is an integer number (46525186718865).

Almost surely, 2^{639919059970246} is an apocalyptic number.

639919059970246 is a deficient number, since it is larger than the sum of its proper divisors (476685421282514).

639919059970246 is a wasteful number, since it uses less digits than its factorization.

639919059970246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64441348 (or 64441341 counting only the distinct ones).

The product of its (nonzero) digits is 1785641760, while the sum is 79.

The spelling of 639919059970246 in words is "six hundred thirty-nine trillion, nine hundred nineteen billion, fifty-nine million, nine hundred seventy thousand, two hundred forty-six".