18381591352 has 16 divisors (see below), whose sum is σ = 35963983440. Its totient is φ = 8791195776.

The previous prime is 18381591341. The next prime is 18381591353. The reversal of 18381591352 is 25319518381.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381591353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49949793 + ... + 49950160.

It is an arithmetic number, because the mean of its divisors is an integer number (2247748965).

Almost surely, 2^18381591352 is an apocalyptic number.

It is an amenable number.

18381591352 is a deficient number, since it is larger than the sum of its proper divisors (17582392088).

18381591352 is a wasteful number, since it uses less digits than its factorization.

18381591352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99899982 (or 99899978 counting only the distinct ones).

The product of its digits is 259200, while the sum is 46.

The spelling of 18381591352 in words is "eighteen billion, three hundred eighty-one million, five hundred ninety-one thousand, three hundred fifty-two".