1813021066 has 32 divisors (see below), whose sum is σ = 2955793680. Its totient is φ = 830668800.

The previous prime is 1813021057. The next prime is 1813021073. The reversal of 1813021066 is 6601203181.

It can be written as a sum of positive squares in 8 ways, for example, as 1614352041 + 198669025 = 40179^2 + 14095^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892540 + ... + 894568.

Almost surely, 2^1813021066 is an apocalyptic number.

1813021066 is a deficient number, since it is larger than the sum of its proper divisors (1142772614).

1813021066 is a wasteful number, since it uses less digits than its factorization.

1813021066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1813021066 is about 42579.5850848737. The cubic root of 1813021066 is about 1219.3665676181.

The spelling of 1813021066 in words is "one billion, eight hundred thirteen million, twenty-one thousand, sixty-six".