420261263161 has 2 divisors, whose sum is σ = 420261263162. Its totient is φ = 420261263160.

The previous prime is 420261263143. The next prime is 420261263167. The reversal of 420261263161 is 161362162024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 335605869225 + 84655393936 = 579315^2 + 290956^2 .

It is a cyclic number.

It is not a de Polignac number, because 420261263161 - 2⁷ = 420261263033 is a prime.

It is not a weakly prime, because it can be changed into another prime (420261263167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210130631580 + 210130631581.

It is an arithmetic number, because the mean of its divisors is an integer number (210130631581).

Almost surely, 2^420261263161 is an apocalyptic number.

It is an amenable number.

420261263161 is a deficient number, since it is larger than the sum of its proper divisors (1).

420261263161 is an equidigital number, since it uses as much as digits as its factorization.

420261263161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 420261263161 in words is "four hundred twenty billion, two hundred sixty-one million, two hundred sixty-three thousand, one hundred sixty-one".