642648846277 has 2 divisors, whose sum is σ = 642648846278. Its totient is φ = 642648846276.

The previous prime is 642648846227. The next prime is 642648846299. The reversal of 642648846277 is 772648846246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604702195876 + 37946650401 = 777626^2 + 194799^2 .

It is a cyclic number.

It is not a de Polignac number, because 642648846277 - 2¹⁹ = 642648321989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642648846227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321324423138 + 321324423139.

It is an arithmetic number, because the mean of its divisors is an integer number (321324423139).

Almost surely, 2^642648846277 is an apocalyptic number.

It is an amenable number.

642648846277 is a deficient number, since it is larger than the sum of its proper divisors (1).

642648846277 is an equidigital number, since it uses as much as digits as its factorization.

642648846277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 173408256, while the sum is 64.

The spelling of 642648846277 in words is "six hundred forty-two billion, six hundred forty-eight million, eight hundred forty-six thousand, two hundred seventy-seven".