18072517945 has 16 divisors (see below), whose sum is σ = 23359343040. Its totient is φ = 13378526784.

The previous prime is 18072517937. The next prime is 18072517963. The reversal of 18072517945 is 54971527081.

It is a cyclic number.

It is not a de Polignac number, because 18072517945 - 2³ = 18072517937 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, 2207974 + ... + 2216143.

It is an arithmetic number, because the mean of its divisors is an integer number (1459958940).

Almost surely, 2^18072517945 is an apocalyptic number.

It is an amenable number.

18072517945 is a deficient number, since it is larger than the sum of its proper divisors (5286825095).

18072517945 is a wasteful number, since it uses less digits than its factorization.

18072517945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424184.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 18072517945 in words is "eighteen billion, seventy-two million, five hundred seventeen thousand, nine hundred forty-five".