818647678690 has 16 divisors (see below), whose sum is σ = 1495559342592. Its totient is φ = 322571622384.

The previous prime is 818647678679. The next prime is 818647678799. The reversal of 818647678690 is 96876746818.

It is a happy number.

It is a super-2 number, since 2×818647678690² (a number of 25 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 610930434 + ... + 610931773.

It is an arithmetic number, because the mean of its divisors is an integer number (93472458912).

Almost surely, 2^818647678690 is an apocalyptic number.

818647678690 is a deficient number, since it is larger than the sum of its proper divisors (676911663902).

818647678690 is a wasteful number, since it uses less digits than its factorization.

818647678690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221862281.

The product of its (nonzero) digits is 195084288, while the sum is 70.

The spelling of 818647678690 in words is "eight hundred eighteen billion, six hundred forty-seven million, six hundred seventy-eight thousand, six hundred ninety".