816395767593618 has 128 divisors (see below), whose sum is σ = 1688747826055680. Its totient is φ = 263023397683200.

The previous prime is 816395767593563. The next prime is 816395767593629.

It is a happy number.

816395767593618 is nontrivially palindromic in base 10.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2042224363 + ... + 2042624081.

It is an arithmetic number, because the mean of its divisors is an integer number (13193342391060).

Almost surely, 2^{816395767593618} is an apocalyptic number.

816395767593618 is an abundant number, since it is smaller than the sum of its proper divisors (872352058462062).

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

816395767593618 is a wasteful number, since it uses less digits than its factorization.

816395767593618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400372.

The product of its digits is 12345177600, while the sum is 84.

The spelling of 816395767593618 in words is "eight hundred sixteen trillion, three hundred ninety-five billion, seven hundred sixty-seven million, five hundred ninety-three thousand, six hundred eighteen".