18145165745 has 24 divisors (see below), whose sum is σ = 26013755304. Its totient is φ = 12106112256.

The previous prime is 18145165733. The next prime is 18145165837. The reversal of 18145165745 is 54756154181.

It can be written as a sum of positive squares in 4 ways, for example, as 8651976256 + 9493189489 = 93016^2 + 97433^2 .

It is not a de Polignac number, because 18145165745 - 2³⁰ = 17071423921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18145165745.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 991772 + ... + 1009901.

It is an arithmetic number, because the mean of its divisors is an integer number (1083906471).

Almost surely, 2^18145165745 is an apocalyptic number.

It is an amenable number.

18145165745 is a deficient number, since it is larger than the sum of its proper divisors (7868589559).

18145165745 is a wasteful number, since it uses less digits than its factorization.

18145165745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001729 (or 2001722 counting only the distinct ones).

The product of its digits is 672000, while the sum is 47.

The spelling of 18145165745 in words is "eighteen billion, one hundred forty-five million, one hundred sixty-five thousand, seven hundred forty-five".