1845166139 has 4 divisors (see below), whose sum is σ = 1845605256. Its totient is φ = 1844727024.

The previous prime is 1845166129. The next prime is 1845166157. The reversal of 1845166139 is 9316615481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1845166139 - 2⁴ = 1845166123 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 1845166139.

It is not an unprimeable number, because it can be changed into a prime (1845166129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213194 + ... + 221679.

It is an arithmetic number, because the mean of its divisors is an integer number (461401314).

Almost surely, 2^1845166139 is an apocalyptic number.

1845166139 is a deficient number, since it is larger than the sum of its proper divisors (439117).

1845166139 is an equidigital number, since it uses as much as digits as its factorization.

1845166139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439116.

The product of its digits is 155520, while the sum is 44.

The square root of 1845166139 is about 42955.3970881425. The cubic root of 1845166139 is about 1226.5308949133.

The spelling of 1845166139 in words is "one billion, eight hundred forty-five million, one hundred sixty-six thousand, one hundred thirty-nine".