1801140660 has 216 divisors, whose sum is σ = 6154811208. Its totient is φ = 425779200.

The previous prime is 1801140637. The next prime is 1801140707. The reversal of 1801140660 is 660411081.

It can be written as a sum of positive squares in 4 ways, for example, as 94128804 + 1707011856 = 9702^2 + 41316^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 891972 + ... + 893988.

Almost surely, 2^1801140660 is an apocalyptic number.

1801140660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1801140660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3077405604).

1801140660 is an abundant number, since it is smaller than the sum of its proper divisors (4353670548).

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

1801140660 is a wasteful number, since it uses less digits than its factorization.

1801140660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095 (or 2079 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1801140660 is about 42439.8475492078. The cubic root of 1801140660 is about 1216.6972976171.

The spelling of 1801140660 in words is "one billion, eight hundred one million, one hundred forty thousand, six hundred sixty".