7998765601 has 2 divisors, whose sum is σ = 7998765602. Its totient is φ = 7998765600.

The previous prime is 7998765589. The next prime is 7998765611. The reversal of 7998765601 is 1065678997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6234681600 + 1764084001 = 78960^2 + 42001^2 .

It is a cyclic number.

It is not a de Polignac number, because 7998765601 - 2⁵ = 7998765569 is a prime.

It is a super-2 number, since 2×7998765601² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7998765611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3999382800 + 3999382801.

It is an arithmetic number, because the mean of its divisors is an integer number (3999382801).

Almost surely, 2^7998765601 is an apocalyptic number.

It is an amenable number.

7998765601 is a deficient number, since it is larger than the sum of its proper divisors (1).

7998765601 is an equidigital number, since it uses as much as digits as its factorization.

7998765601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 58.

The square root of 7998765601 is about 89435.8183335961. The cubic root of 7998765601 is about 1999.8971281254.

The spelling of 7998765601 in words is "seven billion, nine hundred ninety-eight million, seven hundred sixty-five thousand, six hundred one".