420664430555 has 16 divisors (see below), whose sum is σ = 510799411200. Its totient is φ = 332544266208.

The previous prime is 420664430539. The next prime is 420664430603. The reversal of 420664430555 is 555034466024.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 420664430555 - 2⁴ = 420664430539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 643655 + ... + 1120544.

It is an arithmetic number, because the mean of its divisors is an integer number (31924963200).

Almost surely, 2^420664430555 is an apocalyptic number.

420664430555 is a deficient number, since it is larger than the sum of its proper divisors (90134980645).

420664430555 is a wasteful number, since it uses less digits than its factorization.

420664430555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764770.

The product of its (nonzero) digits is 1728000, while the sum is 44.

Adding to 420664430555 its reverse (555034466024), we get a palindrome (975698896579).

The spelling of 420664430555 in words is "four hundred twenty billion, six hundred sixty-four million, four hundred thirty thousand, five hundred fifty-five".