420617718649 has 2 divisors, whose sum is σ = 420617718650. Its totient is φ = 420617718648.

The previous prime is 420617718629. The next prime is 420617718671. The reversal of 420617718649 is 946817716024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390950067600 + 29667651049 = 625260^2 + 172243^2 .

It is a cyclic number.

It is not a de Polignac number, because 420617718649 - 2¹¹ = 420617716601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420617718649.

It is not a weakly prime, because it can be changed into another prime (420617718629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210308859324 + 210308859325.

It is an arithmetic number, because the mean of its divisors is an integer number (210308859325).

Almost surely, 2^420617718649 is an apocalyptic number.

It is an amenable number.

420617718649 is a deficient number, since it is larger than the sum of its proper divisors (1).

420617718649 is an equidigital number, since it uses as much as digits as its factorization.

420617718649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 420617718649 in words is "four hundred twenty billion, six hundred seventeen million, seven hundred eighteen thousand, six hundred forty-nine".