1815166806 has 64 divisors (see below), whose sum is σ = 3893702400. Its totient is φ = 564091008.

The previous prime is 1815166763. The next prime is 1815166807. The reversal of 1815166806 is 6086615181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1815166807) 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 31 ways as a sum of consecutive naturals, for example, 4097221 + ... + 4097663.

It is an arithmetic number, because the mean of its divisors is an integer number (60839100).

Almost surely, 2^1815166806 is an apocalyptic number.

1815166806 is an abundant number, since it is smaller than the sum of its proper divisors (2078535594).

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

1815166806 is a wasteful number, since it uses less digits than its factorization.

1815166806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1815166806 is about 42604.7744507585. The cubic root of 1815166806 is about 1219.8474247070.

The spelling of 1815166806 in words is "one billion, eight hundred fifteen million, one hundred sixty-six thousand, eight hundred six".