420333085561 has 3 divisors (see below), whose sum is σ = 420333733893. Its totient is φ = 420332437230.

The previous prime is 420333085537. The next prime is 420333085573. The reversal of 420333085561 is 165580333024.

The square root of 420333085561 is 648331.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 420333085561 - 2²⁷ = 420198867833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420333085511) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 324166 + ... + 972496.

It is an arithmetic number, because the mean of its divisors is an integer number (140111244631).

Almost surely, 2^420333085561 is an apocalyptic number.

420333085561 is the 648331-st square number.

420333085561 is the 324166-th centered octagonal number.

It is an amenable number.

420333085561 is a deficient number, since it is larger than the sum of its proper divisors (648332).

420333085561 is an frugal number, since it uses more digits than its factorization.

420333085561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296662 (or 648331 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 420333085561 in words is "four hundred twenty billion, three hundred thirty-three million, eighty-five thousand, five hundred sixty-one".