420560421667 has 4 divisors (see below), whose sum is σ = 421416960696. Its totient is φ = 419703882640.

The previous prime is 420560421653. The next prime is 420560421679. The reversal of 420560421667 is 766124065024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420560421667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420560421367) 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, 428268778 + ... + 428269759.

It is an arithmetic number, because the mean of its divisors is an integer number (105354240174).

Almost surely, 2^420560421667 is an apocalyptic number.

420560421667 is a deficient number, since it is larger than the sum of its proper divisors (856539029).

420560421667 is an equidigital number, since it uses as much as digits as its factorization.

420560421667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856539028.

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 420560421667 in words is "four hundred twenty billion, five hundred sixty million, four hundred twenty-one thousand, six hundred sixty-seven".