7716536621 has 2 divisors, whose sum is σ = 7716536622. Its totient is φ = 7716536620.

The previous prime is 7716536609. The next prime is 7716536627. The reversal of 7716536621 is 1266356177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7403742025 + 312794596 = 86045^2 + 17686^2 .

It is an emirp because it is prime and its reverse (1266356177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7716536621 - 2¹⁰ = 7716535597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7716536627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3858268310 + 3858268311.

It is an arithmetic number, because the mean of its divisors is an integer number (3858268311).

Almost surely, 2^7716536621 is an apocalyptic number.

It is an amenable number.

7716536621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7716536621 is an equidigital number, since it uses as much as digits as its factorization.

7716536621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 7716536621 is about 87843.8194809401. The cubic root of 7716536621 is about 1976.0934282625.

The spelling of 7716536621 in words is "seven billion, seven hundred sixteen million, five hundred thirty-six thousand, six hundred twenty-one".