704638567621 has 2 divisors, whose sum is σ = 704638567622. Its totient is φ = 704638567620.

The previous prime is 704638567561. The next prime is 704638567663. The reversal of 704638567621 is 126765836407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686513330721 + 18125236900 = 828561^2 + 134630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-704638567621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (704638567921) 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, 352319283810 + 352319283811.

It is an arithmetic number, because the mean of its divisors is an integer number (352319283811).

Almost surely, 2^704638567621 is an apocalyptic number.

It is an amenable number.

704638567621 is a deficient number, since it is larger than the sum of its proper divisors (1).

704638567621 is an equidigital number, since it uses as much as digits as its factorization.

704638567621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 704638567621 in words is "seven hundred four billion, six hundred thirty-eight million, five hundred sixty-seven thousand, six hundred twenty-one".