11381631818 has 16 divisors (see below), whose sum is σ = 18088660800. Its totient is φ = 5352520896.

The previous prime is 11381631817. The next prime is 11381631829. The reversal of 11381631818 is 81813618311.

It is not an unprimeable number, because it can be changed into a prime (11381631817) 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, 58118 + ... + 161681.

It is an arithmetic number, because the mean of its divisors is an integer number (1130541300).

Almost surely, 2^11381631818 is an apocalyptic number.

11381631818 is a deficient number, since it is larger than the sum of its proper divisors (6707028982).

11381631818 is a wasteful number, since it uses less digits than its factorization.

11381631818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221341.

The product of its digits is 27648, while the sum is 41.

The spelling of 11381631818 in words is "eleven billion, three hundred eighty-one million, six hundred thirty-one thousand, eight hundred eighteen".