18561026818 has 16 divisors (see below), whose sum is σ = 29129956416. Its totient is φ = 8853205680.

The previous prime is 18561026789. The next prime is 18561026833. The reversal of 18561026818 is 81862016581.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523728 + ... + 558043.

It is an arithmetic number, because the mean of its divisors is an integer number (1820622276).

Almost surely, 2^18561026818 is an apocalyptic number.

18561026818 is a deficient number, since it is larger than the sum of its proper divisors (10568929598).

18561026818 is a wasteful number, since it uses less digits than its factorization.

18561026818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082169.

The product of its (nonzero) digits is 184320, while the sum is 46.

The spelling of 18561026818 in words is "eighteen billion, five hundred sixty-one million, twenty-six thousand, eight hundred eighteen".