420206644447 has 2 divisors, whose sum is σ = 420206644448. Its totient is φ = 420206644446.

The previous prime is 420206644399. The next prime is 420206644489. The reversal of 420206644447 is 744446602024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420206644447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420206624447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210103322223 + 210103322224.

It is an arithmetic number, because the mean of its divisors is an integer number (210103322224).

Almost surely, 2^420206644447 is an apocalyptic number.

420206644447 is a deficient number, since it is larger than the sum of its proper divisors (1).

420206644447 is an equidigital number, since it uses as much as digits as its factorization.

420206644447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 43.

The spelling of 420206644447 in words is "four hundred twenty billion, two hundred six million, six hundred forty-four thousand, four hundred forty-seven".