1811661088 has 24 divisors (see below), whose sum is σ = 3689699580. Its totient is φ = 874594560.

The previous prime is 1811661073. The next prime is 1811661091. The reversal of 1811661088 is 8801661181.

It can be written as a sum of positive squares in 2 ways, for example, as 1805570064 + 6091024 = 42492^2 + 2468^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1811661088.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975183 + ... + 977038.

Almost surely, 2^1811661088 is an apocalyptic number.

It is an amenable number.

1811661088 is an abundant number, since it is smaller than the sum of its proper divisors (1878038492).

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

1811661088 is a wasteful number, since it uses less digits than its factorization.

1811661088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952260 (or 1952252 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 40.

The square root of 1811661088 is about 42563.6122527212. The cubic root of 1811661088 is about 1219.0616021376.

The spelling of 1811661088 in words is "one billion, eight hundred eleven million, six hundred sixty-one thousand, eighty-eight".