420657565 has 4 divisors (see below), whose sum is σ = 504789084. Its totient is φ = 336526048.

The previous prime is 420657539. The next prime is 420657577. The reversal of 420657565 is 565756024.

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 333683289 + 86974276 = 18267^2 + 9326^2 .

It is a cyclic number.

It is not a de Polignac number, because 420657565 - 2⁵ = 420657533 is a prime.

It is a Duffinian number.

It is a congruent 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, 42065752 + ... + 42065761.

It is an arithmetic number, because the mean of its divisors is an integer number (126197271).

Almost surely, 2^420657565 is an apocalyptic number.

It is an amenable number.

420657565 is a deficient number, since it is larger than the sum of its proper divisors (84131519).

420657565 is an equidigital number, since it uses as much as digits as its factorization.

420657565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84131518.

The product of its (nonzero) digits is 252000, while the sum is 40.

The square root of 420657565 is about 20509.9382007845. The cubic root of 420657565 is about 749.2778619490.

The spelling of 420657565 in words is "four hundred twenty million, six hundred fifty-seven thousand, five hundred sixty-five".