18155940063 has 8 divisors (see below), whose sum is σ = 24223084848. Its totient is φ = 12096377664.

The previous prime is 18155940037. The next prime is 18155940073. The reversal of 18155940063 is 36004955181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18155940063 - 2¹⁴ = 18155923679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18155939997 and 18155940024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18155940073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1890006 + ... + 1899587.

It is an arithmetic number, because the mean of its divisors is an integer number (3027885606).

Almost surely, 2^18155940063 is an apocalyptic number.

18155940063 is a deficient number, since it is larger than the sum of its proper divisors (6067144785).

18155940063 is a wasteful number, since it uses less digits than its factorization.

18155940063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3791193.

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 18155940063 in words is "eighteen billion, one hundred fifty-five million, nine hundred forty thousand, sixty-three".