1665332240 has 160 divisors (see below), whose sum is σ = 4816941696. Its totient is φ = 526049280.

The previous prime is 1665332233. The next prime is 1665332267. The reversal of 1665332240 is 422335661.

It is a junction number, because it is equal to n+sod(n) for n = 1665332197 and 1665332206.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190199 + ... + 198761.

Almost surely, 2^1665332240 is an apocalyptic number.

1665332240 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 1665332240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2408470848).

1665332240 is an abundant number, since it is smaller than the sum of its proper divisors (3151609456).

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

1665332240 is a wasteful number, since it uses less digits than its factorization.

1665332240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8617 (or 8611 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 1665332240 is about 40808.4824515688. The cubic root of 1665332240 is about 1185.3145894575.

The spelling of 1665332240 in words is "one billion, six hundred sixty-five million, three hundred thirty-two thousand, two hundred forty".