420808287997 has 2 divisors, whose sum is σ = 420808287998. Its totient is φ = 420808287996.

The previous prime is 420808287961. The next prime is 420808288037. The reversal of 420808287997 is 799782808024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420311042596 + 497245401 = 648314^2 + 22299^2 .

It is a cyclic number.

It is not a de Polignac number, because 420808287997 - 2²³ = 420799899389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420808281997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210404143998 + 210404143999.

It is an arithmetic number, because the mean of its divisors is an integer number (210404143999).

Almost surely, 2^420808287997 is an apocalyptic number.

It is an amenable number.

420808287997 is a deficient number, since it is larger than the sum of its proper divisors (1).

420808287997 is an equidigital number, since it uses as much as digits as its factorization.

420808287997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32514048, while the sum is 64.

The spelling of 420808287997 in words is "four hundred twenty billion, eight hundred eight million, two hundred eighty-seven thousand, nine hundred ninety-seven".