420156419779 has 2 divisors, whose sum is σ = 420156419780. Its totient is φ = 420156419778.

The previous prime is 420156419773. The next prime is 420156419843. The reversal of 420156419779 is 977914651024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420156419779 - 2¹⁵ = 420156387011 is a prime.

It is not a weakly prime, because it can be changed into another prime (420156419773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210078209889 + 210078209890.

It is an arithmetic number, because the mean of its divisors is an integer number (210078209890).

Almost surely, 2^420156419779 is an apocalyptic number.

420156419779 is a deficient number, since it is larger than the sum of its proper divisors (1).

420156419779 is an equidigital number, since it uses as much as digits as its factorization.

420156419779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 420156419779 in words is "four hundred twenty billion, one hundred fifty-six million, four hundred nineteen thousand, seven hundred seventy-nine".