708961650021 has 12 divisors (see below), whose sum is σ = 1059367983180. Its totient is φ = 456343130880.

The previous prime is 708961650013. The next prime is 708961650031. The reversal of 708961650021 is 120056169807.

708961650021 is a `hidden beast` number, since 7 + 0 + 8 + 9 + 616 + 5 + 0 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 181284350625 + 527677299396 = 425775^2 + 726414^2 .

It is not a de Polignac number, because 708961650021 - 2³ = 708961650013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (708961650031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1358163820 + ... + 1358164341.

It is an arithmetic number, because the mean of its divisors is an integer number (88280665265).

Almost surely, 2^708961650021 is an apocalyptic number.

It is an amenable number.

708961650021 is a deficient number, since it is larger than the sum of its proper divisors (350406333159).

708961650021 is a wasteful number, since it uses less digits than its factorization.

708961650021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716328196 (or 2716328193 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 708961650021 in words is "seven hundred eight billion, nine hundred sixty-one million, six hundred fifty thousand, twenty-one".