420423264581 has 4 divisors (see below), whose sum is σ = 421023013164. Its totient is φ = 419823516000.

The previous prime is 420423264577. The next prime is 420423264629. The reversal of 420423264581 is 185462324024.

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 400720650625 + 19702613956 = 633025^2 + 140366^2 .

It is a cyclic number.

It is not a de Polignac number, because 420423264581 - 2² = 420423264577 is a prime.

It is a super-2 number, since 2×420423264581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420423260581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299873240 + ... + 299874641.

It is an arithmetic number, because the mean of its divisors is an integer number (105255753291).

Almost surely, 2^420423264581 is an apocalyptic number.

It is an amenable number.

420423264581 is a deficient number, since it is larger than the sum of its proper divisors (599748583).

420423264581 is an equidigital number, since it uses as much as digits as its factorization.

420423264581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599748582.

The product of its (nonzero) digits is 368640, while the sum is 41.

The spelling of 420423264581 in words is "four hundred twenty billion, four hundred twenty-three million, two hundred sixty-four thousand, five hundred eighty-one".