1665200453 has 4 divisors (see below), whose sum is σ = 1903086240. Its totient is φ = 1427314668.

The previous prime is 1665200443. The next prime is 1665200501. The reversal of 1665200453 is 3540025661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1665200453 - 2⁶ = 1665200389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665200443) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 118942883 + ... + 118942896.

It is an arithmetic number, because the mean of its divisors is an integer number (475771560).

Almost surely, 2^1665200453 is an apocalyptic number.

It is an amenable number.

1665200453 is a deficient number, since it is larger than the sum of its proper divisors (237885787).

1665200453 is an equidigital number, since it uses as much as digits as its factorization.

1665200453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237885786.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 1665200453 is about 40806.8677185593. The cubic root of 1665200453 is about 1185.2833217879.

The spelling of 1665200453 in words is "one billion, six hundred sixty-five million, two hundred thousand, four hundred fifty-three".