18022981545 has 40 divisors (see below), whose sum is σ = 34208338824. Its totient is φ = 9046826496.

The previous prime is 18022981541. The next prime is 18022981549. The reversal of 18022981545 is 54518922081.

18022981545 is a `hidden beast` number, since 1 + 8 + 0 + 2 + 29 + 81 + 545 = 666.

It is an interprime number because it is at equal distance from previous prime (18022981541) and next prime (18022981549).

It can be written as a sum of positive squares in 4 ways, for example, as 7116103449 + 10906878096 = 84357^2 + 104436^2 .

It is not a de Polignac number, because 18022981545 - 2² = 18022981541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18022981545.

It is not an unprimeable number, because it can be changed into a prime (18022981541) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1301974 + ... + 1315743.

Almost surely, 2^18022981545 is an apocalyptic number.

18022981545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18022981545 is a deficient number, since it is larger than the sum of its proper divisors (16185357279).

18022981545 is a wasteful number, since it uses less digits than its factorization.

18022981545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617751 (or 2617742 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 18022981545 in words is "eighteen billion, twenty-two million, nine hundred eighty-one thousand, five hundred forty-five".