9720863551513 has 2 divisors, whose sum is σ = 9720863551514. Its totient is φ = 9720863551512.

The previous prime is 9720863551481. The next prime is 9720863551519. The reversal of 9720863551513 is 3151553680279.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5967530779609 + 3753332771904 = 2442853^2 + 1937352^2 .

It is a cyclic number.

It is not a de Polignac number, because 9720863551513 - 2⁵ = 9720863551481 is a prime.

It is not a weakly prime, because it can be changed into another prime (9720863551519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860431775756 + 4860431775757.

It is an arithmetic number, because the mean of its divisors is an integer number (4860431775757).

Almost surely, 2^{9720863551513} is an apocalyptic number.

It is an amenable number.

9720863551513 is a deficient number, since it is larger than the sum of its proper divisors (1).

9720863551513 is an equidigital number, since it uses as much as digits as its factorization.

9720863551513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 9720863551513 in words is "nine trillion, seven hundred twenty billion, eight hundred sixty-three million, five hundred fifty-one thousand, five hundred thirteen".