7921665652 has 6 divisors (see below), whose sum is σ = 13862914898. Its totient is φ = 3960832824.

The previous prime is 7921665643. The next prime is 7921665677. The reversal of 7921665652 is 2565661297.

It can be written as a sum of positive squares in only one way, i.e., 5377875556 + 2543790096 = 73334^2 + 50436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7921665596 and 7921665605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990208203 + ... + 990208210.

Almost surely, 2^7921665652 is an apocalyptic number.

It is an amenable number.

7921665652 is a deficient number, since it is larger than the sum of its proper divisors (5941249246).

7921665652 is a wasteful number, since it uses less digits than its factorization.

7921665652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980416417 (or 1980416415 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 49.

The square root of 7921665652 is about 89003.7395394149. The cubic root of 7921665652 is about 1993.4507145064.

The spelling of 7921665652 in words is "seven billion, nine hundred twenty-one million, six hundred sixty-five thousand, six hundred fifty-two".