9720863551481 has 2 divisors, whose sum is σ = 9720863551482. Its totient is φ = 9720863551480.

The previous prime is 9720863551471. The next prime is 9720863551513. The reversal of 9720863551481 is 1841553680279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6682953989881 + 3037909561600 = 2585141^2 + 1742960^2 .

It is an emirp because it is prime and its reverse (1841553680279) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9720863551481 is a prime.

It is a super-2 number, since 2×9720863551481² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9720863551481.

It is not a weakly prime, because it can be changed into another prime (9720863551471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860431775740 + 4860431775741.

It is an arithmetic number, because the mean of its divisors is an integer number (4860431775741).

It is a 1-persistent number, because it is pandigital, but 2⋅9720863551481 = 19441727102962 is not.

Almost surely, 2^{9720863551481} is an apocalyptic number.

It is an amenable number.

9720863551481 is a deficient number, since it is larger than the sum of its proper divisors (1).

9720863551481 is an equidigital number, since it uses as much as digits as its factorization.

9720863551481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 9720863551481 in words is "nine trillion, seven hundred twenty billion, eight hundred sixty-three million, five hundred fifty-one thousand, four hundred eighty-one".