1812080500605 has 80 divisors (see below), whose sum is σ = 3343364007984. Its totient is φ = 938279531520.

The previous prime is 1812080500603. The next prime is 1812080500609. The reversal of 1812080500605 is 5060050802181.

1812080500605 is a `hidden beast` number, since 1 + 8 + 12 + 0 + 80 + 500 + 60 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 317845633284 + 1494234867321 = 563778^2 + 1222389^2 .

It is not a de Polignac number, because 1812080500605 - 2¹ = 1812080500603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1812080500605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812080500603) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6776929 + ... + 7039241.

Almost surely, 2^{1812080500605} is an apocalyptic number.

1812080500605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1812080500605 is a deficient number, since it is larger than the sum of its proper divisors (1531283507379).

1812080500605 is a wasteful number, since it uses less digits than its factorization.

1812080500605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262828 (or 262819 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 1812080500605 in words is "one trillion, eight hundred twelve billion, eighty million, five hundred thousand, six hundred five".