18306268791890 has 16 divisors (see below), whose sum is σ = 32970297869208. Its totient is φ = 7318282173696.

The previous prime is 18306268791871. The next prime is 18306268791893. The reversal of 18306268791890 is 9819786260381.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16491452975089 + 1814815816801 = 4060967^2 + 1347151^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18306268791890.

It is not an unprimeable number, because it can be changed into a prime (18306268791893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528149687 + ... + 528184346.

Almost surely, 2^{18306268791890} is an apocalyptic number.

18306268791890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18306268791890 is a deficient number, since it is larger than the sum of its proper divisors (14664029077318).

18306268791890 is a wasteful number, since it uses less digits than its factorization.

18306268791890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056335773.

The product of its (nonzero) digits is 62705664, while the sum is 68.

The spelling of 18306268791890 in words is "eighteen trillion, three hundred six billion, two hundred sixty-eight million, seven hundred ninety-one thousand, eight hundred ninety".