91344278618 has 16 divisors (see below), whose sum is σ = 138561229800. Its totient is φ = 45158102016.

The previous prime is 91344278587. The next prime is 91344278639. The reversal of 91344278618 is 81687244319.

It can be written as a sum of positive squares in 4 ways, for example, as 91039182529 + 305096089 = 301727^2 + 17467^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91344278618.

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, 20921 + ... + 427932.

Almost surely, 2^91344278618 is an apocalyptic number.

91344278618 is a deficient number, since it is larger than the sum of its proper divisors (47216951182).

91344278618 is a wasteful number, since it uses less digits than its factorization.

91344278618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450001.

The product of its digits is 2322432, while the sum is 53.

The spelling of 91344278618 in words is "ninety-one billion, three hundred forty-four million, two hundred seventy-eight thousand, six hundred eighteen".