18081381415 has 16 divisors (see below), whose sum is σ = 21837953088. Its totient is φ = 14371658496.

The previous prime is 18081381401. The next prime is 18081381431. The reversal of 18081381415 is 51418318081.

It is a cyclic number.

It is not a de Polignac number, because 18081381415 - 2¹⁵ = 18081348647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2462089 + ... + 2469421.

It is an arithmetic number, because the mean of its divisors is an integer number (1364872068).

Almost surely, 2^18081381415 is an apocalyptic number.

18081381415 is a deficient number, since it is larger than the sum of its proper divisors (3756571673).

18081381415 is a wasteful number, since it uses less digits than its factorization.

18081381415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10458.

The product of its (nonzero) digits is 30720, while the sum is 40.

Adding to 18081381415 its reverse (51418318081), we get a palindrome (69499699496).

The spelling of 18081381415 in words is "eighteen billion, eighty-one million, three hundred eighty-one thousand, four hundred fifteen".