420507608561 has 2 divisors, whose sum is σ = 420507608562. Its totient is φ = 420507608560.

The previous prime is 420507608551. The next prime is 420507608641. The reversal of 420507608561 is 165806705024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349613220961 + 70894387600 = 591281^2 + 266260^2 .

It is a cyclic number.

It is not a de Polignac number, because 420507608561 - 2⁶ = 420507608497 is a prime.

It is not a weakly prime, because it can be changed into another prime (420507608531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210253804280 + 210253804281.

It is an arithmetic number, because the mean of its divisors is an integer number (210253804281).

Almost surely, 2^420507608561 is an apocalyptic number.

It is an amenable number.

420507608561 is a deficient number, since it is larger than the sum of its proper divisors (1).

420507608561 is an equidigital number, since it uses as much as digits as its factorization.

420507608561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 420507608561 in words is "four hundred twenty billion, five hundred seven million, six hundred eight thousand, five hundred sixty-one".