7173021681656 has 16 divisors (see below), whose sum is σ = 13449633687000. Its totient is φ = 3586452698464.

The previous prime is 7173021681649. The next prime is 7173021681697. The reversal of 7173021681656 is 6561861203717.

It is a junction number, because it is equal to n+sod(n) for n = 7173021681598 and 7173021681607.

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, 6741230 + ... + 7732413.

Almost surely, 2^{7173021681656} is an apocalyptic number.

It is an amenable number.

7173021681656 is a deficient number, since it is larger than the sum of its proper divisors (6276612005344).

7173021681656 is a wasteful number, since it uses less digits than its factorization.

7173021681656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14535598 (or 14535594 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 7173021681656 in words is "seven trillion, one hundred seventy-three billion, twenty-one million, six hundred eighty-one thousand, six hundred fifty-six".