819139805739702 has 24 divisors (see below), whose sum is σ = 1777989273162336. Its totient is φ = 272556392570736.

The previous prime is 819139805739631. The next prime is 819139805739727. The reversal of 819139805739702 is 207937508931918.

819139805739702 is a `hidden beast` number, since 8 + 1 + 91 + 398 + 0 + 57 + 39 + 70 + 2 = 666.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40850768238 + ... + 40850788289.

It is an arithmetic number, because the mean of its divisors is an integer number (74082886381764).

Almost surely, 2^{819139805739702} is an apocalyptic number.

819139805739702 is an abundant number, since it is smaller than the sum of its proper divisors (958849467422634).

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

819139805739702 is a wasteful number, since it uses less digits than its factorization.

819139805739702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81701557092 (or 81701557089 counting only the distinct ones).

The product of its (nonzero) digits is 205752960, while the sum is 72.

The spelling of 819139805739702 in words is "eight hundred nineteen trillion, one hundred thirty-nine billion, eight hundred five million, seven hundred thirty-nine thousand, seven hundred two".