708604406821 has 2 divisors, whose sum is σ = 708604406822. Its totient is φ = 708604406820.

The previous prime is 708604406791. The next prime is 708604406827. The reversal of 708604406821 is 128604406807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418885961796 + 289718445025 = 647214^2 + 538255^2 .

It is an emirp because it is prime and its reverse (128604406807) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 708604406821 - 2¹³ = 708604398629 is a prime.

It is a super-2 number, since 2×708604406821² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (708604406827) 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, 354302203410 + 354302203411.

It is an arithmetic number, because the mean of its divisors is an integer number (354302203411).

Almost surely, 2^708604406821 is an apocalyptic number.

It is an amenable number.

708604406821 is a deficient number, since it is larger than the sum of its proper divisors (1).

708604406821 is an equidigital number, since it uses as much as digits as its factorization.

708604406821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 708604406821 in words is "seven hundred eight billion, six hundred four million, four hundred six thousand, eight hundred twenty-one".