18381591374 has 16 divisors (see below), whose sum is σ = 27862380000. Its totient is φ = 9094170624.

The previous prime is 18381591373. The next prime is 18381591409. The reversal of 18381591374 is 47319518381.

It is a happy number.

It is a super-3 number, since 3×18381591374³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381591373) 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, 1740542 + ... + 1751070.

It is an arithmetic number, because the mean of its divisors is an integer number (1741398750).

Almost surely, 2^18381591374 is an apocalyptic number.

18381591374 is a deficient number, since it is larger than the sum of its proper divisors (9480788626).

18381591374 is a wasteful number, since it uses less digits than its factorization.

18381591374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19627.

The product of its digits is 725760, while the sum is 50.

The spelling of 18381591374 in words is "eighteen billion, three hundred eighty-one million, five hundred ninety-one thousand, three hundred seventy-four".