7121688561726 has 16 divisors (see below), whose sum is σ = 14243737724928. Its totient is φ = 2373836087000.

The previous prime is 7121688561677. The next prime is 7121688561797. The reversal of 7121688561726 is 6271658861217.

It is a self number, because there is not a number n which added to its sum of digits gives 7121688561726.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14767980 + ... + 15242591.

It is an arithmetic number, because the mean of its divisors is an integer number (890233607808).

Almost surely, 2^{7121688561726} is an apocalyptic number.

7121688561726 is an abundant number, since it is smaller than the sum of its proper divisors (7122049163202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7121688561726 is a wasteful number, since it uses less digits than its factorization.

7121688561726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30050127.

The product of its digits is 13547520, while the sum is 60.

The spelling of 7121688561726 in words is "seven trillion, one hundred twenty-one billion, six hundred eighty-eight million, five hundred sixty-one thousand, seven hundred twenty-six".