18140357391 has 8 divisors (see below), whose sum is σ = 26047692720. Its totient is φ = 11163296832.

The previous prime is 18140357387. The next prime is 18140357413. The reversal of 18140357391 is 19375304181.

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

It is not a de Polignac number, because 18140357391 - 2² = 18140357387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140357311) 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, 232568646 + ... + 232568723.

It is an arithmetic number, because the mean of its divisors is an integer number (3255961590).

Almost surely, 2^18140357391 is an apocalyptic number.

18140357391 is a deficient number, since it is larger than the sum of its proper divisors (7907335329).

18140357391 is a wasteful number, since it uses less digits than its factorization.

18140357391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465137385.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 18140357391 in words is "eighteen billion, one hundred forty million, three hundred fifty-seven thousand, three hundred ninety-one".