1817145612 has 18 divisors (see below), whose sum is σ = 4593340388. Its totient is φ = 605715192.

The previous prime is 1817145611. The next prime is 1817145619. The reversal of 1817145612 is 2165417181.

1817145612 is a `hidden beast` number, since 1 + 81 + 7 + 14 + 561 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 50476267 = 1817145612 / (1 + 8 + 1 + 7 + 1 + 4 + 5 + 6 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (1817145611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25238098 + ... + 25238169.

Almost surely, 2^1817145612 is an apocalyptic number.

1817145612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1817145612 is an abundant number, since it is smaller than the sum of its proper divisors (2776194776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1817145612 is a wasteful number, since it uses less digits than its factorization.

1817145612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50476277 (or 50476272 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 1817145612 is about 42627.9909449179. The cubic root of 1817145612 is about 1220.2905363768.

The spelling of 1817145612 in words is "one billion, eight hundred seventeen million, one hundred forty-five thousand, six hundred twelve".