7721975851201 has 16 divisors (see below), whose sum is σ = 8184145910400. Its totient is φ = 7271073006208.

The previous prime is 7721975851129. The next prime is 7721975851243. The reversal of 7721975851201 is 1021585791277.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7721975851201 is a prime.

It is a super-2 number, since 2×7721975851201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7721975851001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7844446 + ... + 8773783.

It is an arithmetic number, because the mean of its divisors is an integer number (511509119400).

Almost surely, 2^{7721975851201} is an apocalyptic number.

It is an amenable number.

7721975851201 is a deficient number, since it is larger than the sum of its proper divisors (462170059199).

7721975851201 is a wasteful number, since it uses less digits than its factorization.

7721975851201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16618568.

The product of its (nonzero) digits is 2469600, while the sum is 55.

The spelling of 7721975851201 in words is "seven trillion, seven hundred twenty-one billion, nine hundred seventy-five million, eight hundred fifty-one thousand, two hundred one".