18705251345 has 16 divisors (see below), whose sum is σ = 24490078272. Its totient is φ = 13602039360.

The previous prime is 18705251339. The next prime is 18705251413. The reversal of 18705251345 is 54315250781.

It is a happy number.

It is not a de Polignac number, because 18705251345 - 2¹⁶ = 18705185809 is a prime.

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, 521819 + ... + 556511.

It is an arithmetic number, because the mean of its divisors is an integer number (1530629892).

Almost surely, 2^18705251345 is an apocalyptic number.

It is an amenable number.

18705251345 is a deficient number, since it is larger than the sum of its proper divisors (5784826927).

18705251345 is a wasteful number, since it uses less digits than its factorization.

18705251345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44512.

The product of its (nonzero) digits is 168000, while the sum is 41.

The spelling of 18705251345 in words is "eighteen billion, seven hundred five million, two hundred fifty-one thousand, three hundred forty-five".