642803477 has 2 divisors, whose sum is σ = 642803478. Its totient is φ = 642803476.

The previous prime is 642803467. The next prime is 642803489. The reversal of 642803477 is 774308246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484396081 + 158407396 = 22009^2 + 12586^2 .

It is a cyclic number.

It is not a de Polignac number, because 642803477 - 2²² = 638609173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642803437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321401738 + 321401739.

It is an arithmetic number, because the mean of its divisors is an integer number (321401739).

Almost surely, 2^642803477 is an apocalyptic number.

It is an amenable number.

642803477 is a deficient number, since it is larger than the sum of its proper divisors (1).

642803477 is an equidigital number, since it uses as much as digits as its factorization.

642803477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 41.

The square root of 642803477 is about 25353.5693147927. The cubic root of 642803477 is about 863.0303573386.

The spelling of 642803477 in words is "six hundred forty-two million, eight hundred three thousand, four hundred seventy-seven".