19505368618 has 16 divisors (see below), whose sum is σ = 30103726464. Its totient is φ = 9472889440.

The previous prime is 19505368583. The next prime is 19505368637. The reversal of 19505368618 is 81686350591.

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, 505330 + ... + 542557.

It is an arithmetic number, because the mean of its divisors is an integer number (1881482904).

Almost surely, 2^19505368618 is an apocalyptic number.

19505368618 is a deficient number, since it is larger than the sum of its proper divisors (10598357846).

19505368618 is a wasteful number, since it uses less digits than its factorization.

19505368618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048157.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 19505368618 in words is "nineteen billion, five hundred five million, three hundred sixty-eight thousand, six hundred eighteen".