1639994618568 has 32 divisors (see below), whose sum is σ = 4106900556000. Its totient is φ = 545743004928.

The previous prime is 1639994618491. The next prime is 1639994618599. The reversal of 1639994618568 is 8658164999361.

It is a self number, because there is not a number n which added to its sum of digits gives 1639994618568.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57602218 + ... + 57630681.

It is an arithmetic number, because the mean of its divisors is an integer number (128340642375).

Almost surely, 2^{1639994618568} is an apocalyptic number.

It is an amenable number.

1639994618568 is an abundant number, since it is smaller than the sum of its proper divisors (2466905937432).

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

1639994618568 is a wasteful number, since it uses less digits than its factorization.

1639994618568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115233501 (or 115233497 counting only the distinct ones).

The product of its digits is 604661760, while the sum is 75.

The spelling of 1639994618568 in words is "one trillion, six hundred thirty-nine billion, nine hundred ninety-four million, six hundred eighteen thousand, five hundred sixty-eight".