1980166536 has 96 divisors (see below), whose sum is σ = 5442910200. Its totient is φ = 650280960.

The previous prime is 1980166523. The next prime is 1980166597. The reversal of 1980166536 is 6356610891.

It can be written as a sum of positive squares in 4 ways, for example, as 1639764036 + 340402500 = 40494^2 + 18450^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1980166491 and 1980166500.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1962000 + ... + 1963008.

Almost surely, 2^1980166536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980166536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2721455100).

1980166536 is an abundant number, since it is smaller than the sum of its proper divisors (3462743664).

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

1980166536 is a wasteful number, since it uses less digits than its factorization.

1980166536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1392 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1980166536 is about 44499.0621923654. The cubic root of 1980166536 is about 1255.7424401216.

The spelling of 1980166536 in words is "one billion, nine hundred eighty million, one hundred sixty-six thousand, five hundred thirty-six".