639519397846 has 16 divisors (see below), whose sum is σ = 1099211639040. Its totient is φ = 273356574120.

The previous prime is 639519397843. The next prime is 639519397883. The reversal of 639519397846 is 648793915936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639519397843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60258490 + ... + 60269101.

It is an arithmetic number, because the mean of its divisors is an integer number (68700727440).

Almost surely, 2^639519397846 is an apocalyptic number.

639519397846 is a deficient number, since it is larger than the sum of its proper divisors (459692241194).

639519397846 is a wasteful number, since it uses less digits than its factorization.

639519397846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120527979.

The product of its digits is 264539520, while the sum is 70.

The spelling of 639519397846 in words is "six hundred thirty-nine billion, five hundred nineteen million, three hundred ninety-seven thousand, eight hundred forty-six".