420453665 has 4 divisors (see below), whose sum is σ = 504544404. Its totient is φ = 336362928.

The previous prime is 420453653. The next prime is 420453703. The reversal of 420453665 is 566354024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156975841 + 263477824 = 12529^2 + 16232^2 .

It is a cyclic number.

It is not a de Polignac number, because 420453665 - 2¹⁸ = 420191521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42045362 + ... + 42045371.

It is an arithmetic number, because the mean of its divisors is an integer number (126136101).

Almost surely, 2^420453665 is an apocalyptic number.

It is an amenable number.

420453665 is a deficient number, since it is larger than the sum of its proper divisors (84090739).

420453665 is an equidigital number, since it uses as much as digits as its factorization.

420453665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84090738.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 420453665 is about 20504.9668373299. The cubic root of 420453665 is about 749.1567797355.

The spelling of 420453665 in words is "four hundred twenty million, four hundred fifty-three thousand, six hundred sixty-five".