1816501806 has 48 divisors (see below), whose sum is σ = 4532381568. Its totient is φ = 515034000.

The previous prime is 1816501801. The next prime is 1816501849. The reversal of 1816501806 is 6081056181.

It is a super-2 number, since 2×1816501806² = 6599357622402523272, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816501801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38520 + ... + 71531.

It is an arithmetic number, because the mean of its divisors is an integer number (94424616).

Almost surely, 2^1816501806 is an apocalyptic number.

1816501806 is an abundant number, since it is smaller than the sum of its proper divisors (2715879762).

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

1816501806 is a wasteful number, since it uses less digits than its factorization.

1816501806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110197 (or 110194 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1816501806 is about 42620.4388292753. The cubic root of 1816501806 is about 1220.1464049868.

Adding to 1816501806 its reverse (6081056181), we get a palindrome (7897557987).

The spelling of 1816501806 in words is "one billion, eight hundred sixteen million, five hundred one thousand, eight hundred six".