420640674813 has 24 divisors (see below), whose sum is σ = 614651614200. Its totient is φ = 277171259904.

The previous prime is 420640674803. The next prime is 420640674821. The reversal of 420640674813 is 318476046024.

It can be written as a sum of positive squares in 4 ways, for example, as 2325361284 + 418315313529 = 48222^2 + 646773^2 .

It is not a de Polignac number, because 420640674813 - 2⁸ = 420640674557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420640674803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2046193 + ... + 2242361.

It is an arithmetic number, because the mean of its divisors is an integer number (25610483925).

Almost surely, 2^420640674813 is an apocalyptic number.

It is an amenable number.

420640674813 is a deficient number, since it is larger than the sum of its proper divisors (194010939387).

420640674813 is a wasteful number, since it uses less digits than its factorization.

420640674813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198941 (or 198938 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 420640674813 in words is "four hundred twenty billion, six hundred forty million, six hundred seventy-four thousand, eight hundred thirteen".