7121668961 has 8 divisors (see below), whose sum is σ = 7769732544. Its totient is φ = 6473711920.

The previous prime is 7121668913. The next prime is 7121668969. The reversal of 7121668961 is 1698661217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7121668961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7121668969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189260 + ... + 223746.

It is an arithmetic number, because the mean of its divisors is an integer number (971216568).

Almost surely, 2^7121668961 is an apocalyptic number.

It is an amenable number.

7121668961 is a deficient number, since it is larger than the sum of its proper divisors (648063583).

7121668961 is a wasteful number, since it uses less digits than its factorization.

7121668961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53271.

The product of its digits is 217728, while the sum is 47.

The square root of 7121668961 is about 84389.9814018228. The cubic root of 7121668961 is about 1923.9506473777.

It can be divided in two parts, 712166 and 8961, that added together give a palindrome (721127).

The spelling of 7121668961 in words is "seven billion, one hundred twenty-one million, six hundred sixty-eight thousand, nine hundred sixty-one".