81642424618 has 16 divisors (see below), whose sum is σ = 124807296096. Its totient is φ = 40040400400.

The previous prime is 81642424573. The next prime is 81642424621.

81642424618 is nontrivially palindromic in base 10.

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, 308205 + ... + 508207.

It is an arithmetic number, because the mean of its divisors is an integer number (7800456006).

Almost surely, 2^81642424618 is an apocalyptic number.

81642424618 is a deficient number, since it is larger than the sum of its proper divisors (43164871478).

81642424618 is a wasteful number, since it uses less digits than its factorization.

81642424618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203909.

The product of its digits is 589824, while the sum is 46.

The spelling of 81642424618 in words is "eighty-one billion, six hundred forty-two million, four hundred twenty-four thousand, six hundred eighteen".