1665506000 has 80 divisors (see below), whose sum is σ = 4157257728. Its totient is φ = 644688000.

The previous prime is 1665505993. The next prime is 1665506027. The reversal of 1665506000 is 6055661.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 48569 + ... + 75431.

Almost surely, 2^1665506000 is an apocalyptic number.

1665506000 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 1665506000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2078628864).

1665506000 is an abundant number, since it is smaller than the sum of its proper divisors (2491751728).

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

1665506000 is a wasteful number, since it uses less digits than its factorization.

1665506000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26917 (or 26901 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1665506000 is about 40810.6113651830. The cubic root of 1665506000 is about 1185.3558130835.

The spelling of 1665506000 in words is "one billion, six hundred sixty-five million, five hundred six thousand".