1665352140 has 96 divisors (see below), whose sum is σ = 4740120000. Its totient is φ = 436810752.

The previous prime is 1665352133. The next prime is 1665352159. The reversal of 1665352140 is 412535661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 973606 + ... + 975314.

It is an arithmetic number, because the mean of its divisors is an integer number (49376250).

Almost surely, 2^1665352140 is an apocalyptic number.

1665352140 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 1665352140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2370060000).

1665352140 is an abundant number, since it is smaller than the sum of its proper divisors (3074767860).

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

1665352140 is a wasteful number, since it uses less digits than its factorization.

1665352140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979 (or 1977 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1665352140 is about 40808.7262726981. The cubic root of 1665352140 is about 1185.3193107709.

The spelling of 1665352140 in words is "one billion, six hundred sixty-five million, three hundred fifty-two thousand, one hundred forty".