1855249645 has 8 divisors (see below), whose sum is σ = 2249251704. Its totient is φ = 1468898304.

The previous prime is 1855249633. The next prime is 1855249673. The reversal of 1855249645 is 5469425581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 519566436 + 1335683209 = 22794^2 + 36547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1855249645 - 2⁹ = 1855249133 is a prime.

It is a super-3 number, since 3×1855249645³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1912144 + ... + 1913113.

It is an arithmetic number, because the mean of its divisors is an integer number (281156463).

Almost surely, 2^1855249645 is an apocalyptic number.

It is an amenable number.

1855249645 is a deficient number, since it is larger than the sum of its proper divisors (394002059).

1855249645 is an equidigital number, since it uses as much as digits as its factorization.

1855249645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3825359.

The product of its digits is 1728000, while the sum is 49.

The square root of 1855249645 is about 43072.6089876153. The cubic root of 1855249645 is about 1228.7610952864.

The spelling of 1855249645 in words is "one billion, eight hundred fifty-five million, two hundred forty-nine thousand, six hundred forty-five".