816760641393 has 12 divisors (see below), whose sum is σ = 1180033739508. Its totient is φ = 544383231840.

The previous prime is 816760641341. The next prime is 816760641413. The reversal of 816760641393 is 393146067618.

It is a happy number.

816760641393 is a `hidden beast` number, since 8 + 16 + 7 + 606 + 4 + 13 + 9 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 156284227584 + 660476413809 = 395328^2 + 812697^2 .

It is not a de Polignac number, because 816760641393 - 2⁶ = 816760641329 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (816760641293) by changing a digit.

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, 10280098 + ... + 10359243.

It is an arithmetic number, because the mean of its divisors is an integer number (98336144959).

Almost surely, 2^816760641393 is an apocalyptic number.

It is an amenable number.

816760641393 is a deficient number, since it is larger than the sum of its proper divisors (363273098115).

816760641393 is a wasteful number, since it uses less digits than its factorization.

816760641393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20643744 (or 20643741 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 816760641393 in words is "eight hundred sixteen billion, seven hundred sixty million, six hundred forty-one thousand, three hundred ninety-three".