420660461257 has 2 divisors, whose sum is σ = 420660461258. Its totient is φ = 420660461256.

The previous prime is 420660461251. The next prime is 420660461261. The reversal of 420660461257 is 752164066024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 365086642176 + 55573819081 = 604224^2 + 235741^2 .

It is a cyclic number.

It is not a de Polignac number, because 420660461257 - 2⁷ = 420660461129 is a prime.

It is not a weakly prime, because it can be changed into another prime (420660461251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210330230628 + 210330230629.

It is an arithmetic number, because the mean of its divisors is an integer number (210330230629).

Almost surely, 2^420660461257 is an apocalyptic number.

It is an amenable number.

420660461257 is a deficient number, since it is larger than the sum of its proper divisors (1).

420660461257 is an equidigital number, since it uses as much as digits as its factorization.

420660461257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 420660461257 in words is "four hundred twenty billion, six hundred sixty million, four hundred sixty-one thousand, two hundred fifty-seven".