1000721666708 has 12 divisors (see below), whose sum is σ = 1760336819220. Its totient is φ = 497768289792.

The previous prime is 1000721666671. The next prime is 1000721666717. The reversal of 1000721666708 is 8076661270001.

It can be written as a sum of positive squares in 2 ways, for example, as 697662608644 + 303059058064 = 835262^2 + 550508^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648135023 + ... + 648136566.

It is an arithmetic number, because the mean of its divisors is an integer number (146694734935).

Almost surely, 2^{1000721666708} is an apocalyptic number.

It is an amenable number.

1000721666708 is a deficient number, since it is larger than the sum of its proper divisors (759615152512).

1000721666708 is a wasteful number, since it uses less digits than its factorization.

1000721666708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296271786 (or 1296271784 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 1000721666708 in words is "one trillion, seven hundred twenty-one million, six hundred sixty-six thousand, seven hundred eight".