420889173769 has 2 divisors, whose sum is σ = 420889173770. Its totient is φ = 420889173768.

The previous prime is 420889173743. The next prime is 420889173811. The reversal of 420889173769 is 967371988024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341920867600 + 78968306169 = 584740^2 + 281013^2 .

It is a cyclic number.

It is not a de Polignac number, because 420889173769 - 2¹³ = 420889165577 is a prime.

It is a super-2 number, since 2×420889173769² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 420889173769.

It is not a weakly prime, because it can be changed into another prime (420889173869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210444586884 + 210444586885.

It is an arithmetic number, because the mean of its divisors is an integer number (210444586885).

Almost surely, 2^420889173769 is an apocalyptic number.

It is an amenable number.

420889173769 is a deficient number, since it is larger than the sum of its proper divisors (1).

420889173769 is an equidigital number, since it uses as much as digits as its factorization.

420889173769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 420889173769 in words is "four hundred twenty billion, eight hundred eighty-nine million, one hundred seventy-three thousand, seven hundred sixty-nine".