1665965453 has 2 divisors, whose sum is σ = 1665965454. Its totient is φ = 1665965452.

The previous prime is 1665965443. The next prime is 1665965489. The reversal of 1665965453 is 3545695661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1354019209 + 311946244 = 36797^2 + 17662^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665965453 - 2¹⁰ = 1665964429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665965443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832982726 + 832982727.

It is an arithmetic number, because the mean of its divisors is an integer number (832982727).

Almost surely, 2^1665965453 is an apocalyptic number.

It is an amenable number.

1665965453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665965453 is an equidigital number, since it uses as much as digits as its factorization.

1665965453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916000, while the sum is 50.

The square root of 1665965453 is about 40816.2400644645. The cubic root of 1665965453 is about 1185.4648020258.

The spelling of 1665965453 in words is "one billion, six hundred sixty-five million, nine hundred sixty-five thousand, four hundred fifty-three".