1808345855 has 8 divisors (see below), whose sum is σ = 2170746864. Its totient is φ = 1446188800.

The previous prime is 1808345839. The next prime is 1808345857. The reversal of 1808345855 is 5585438081.

It is a happy number.

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

It is not a de Polignac number, because 1808345855 - 2⁴ = 1808345839 is a prime.

It is a super-2 number, since 2×1808345855² = 6540229462591362050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808345857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44261 + ... + 74670.

It is an arithmetic number, because the mean of its divisors is an integer number (271343358).

Almost surely, 2^1808345855 is an apocalyptic number.

1808345855 is a deficient number, since it is larger than the sum of its proper divisors (362401009).

1808345855 is a wasteful number, since it uses less digits than its factorization.

1808345855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121977.

The product of its (nonzero) digits is 768000, while the sum is 47.

The square root of 1808345855 is about 42524.6499691649. The cubic root of 1808345855 is about 1218.3175444682.

The spelling of 1808345855 in words is "one billion, eight hundred eight million, three hundred forty-five thousand, eight hundred fifty-five".