816647746618 has 16 divisors (see below), whose sum is σ = 1394434097856. Its totient is φ = 355064237440.

The previous prime is 816647746531. The next prime is 816647746633.

It is a happy number.

816647746618 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 816647746618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 806963671 + ... + 806964682.

It is an arithmetic number, because the mean of its divisors is an integer number (87152131116).

Almost surely, 2^816647746618 is an apocalyptic number.

816647746618 is a deficient number, since it is larger than the sum of its proper divisors (577786351238).

816647746618 is a wasteful number, since it uses less digits than its factorization.

816647746618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613928389.

The product of its digits is 65028096, while the sum is 64.

The spelling of 816647746618 in words is "eight hundred sixteen billion, six hundred forty-seven million, seven hundred forty-six thousand, six hundred eighteen".