16639681395042 has 12 divisors (see below), whose sum is σ = 36052643022630. Its totient is φ = 5546560465008.

The previous prime is 16639681395011. The next prime is 16639681395053. The reversal of 16639681395042 is 24059318693661.

16639681395042 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 96 + 8 + 1 + 39 + 504 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8644534945281 + 7995146449761 = 2940159^2 + 2827569^2 .

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 462213372067 + ... + 462213372102.

Almost surely, 2^{16639681395042} is an apocalyptic number.

16639681395042 is an abundant number, since it is smaller than the sum of its proper divisors (19412961627588).

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

16639681395042 is a wasteful number, since it uses less digits than its factorization.

16639681395042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924426744177 (or 924426744174 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 16639681395042 in words is "sixteen trillion, six hundred thirty-nine billion, six hundred eighty-one million, three hundred ninety-five thousand, forty-two".