1665345456 has 60 divisors (see below), whose sum is σ = 4678481808. Its totient is φ = 552991872.

The previous prime is 1665345439. The next prime is 1665345481. The reversal of 1665345456 is 6545435661.

1665345456 is a `hidden beast` number, since 1 + 66 + 534 + 5 + 4 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15886 + ... + 59858.

Almost surely, 2^1665345456 is an apocalyptic number.

1665345456 is a gapful number since it is divisible by the number (16) 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 1665345456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2339240904).

1665345456 is an abundant number, since it is smaller than the sum of its proper divisors (3013136352).

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

1665345456 is a wasteful number, since it uses less digits than its factorization.

1665345456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44250 (or 44241 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The square root of 1665345456 is about 40808.6443783667. The cubic root of 1665345456 is about 1185.3177249832.

The spelling of 1665345456 in words is "one billion, six hundred sixty-five million, three hundred forty-five thousand, four hundred fifty-six".