7715686261 has 2 divisors, whose sum is σ = 7715686262. Its totient is φ = 7715686260.

The previous prime is 7715686243. The next prime is 7715686289. The reversal of 7715686261 is 1626865177.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6497327236 + 1218359025 = 80606^2 + 34905^2 .

It is a cyclic number.

It is not a de Polignac number, because 7715686261 - 2⁹ = 7715685749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7715686061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3857843130 + 3857843131.

It is an arithmetic number, because the mean of its divisors is an integer number (3857843131).

Almost surely, 2^7715686261 is an apocalyptic number.

It is an amenable number.

7715686261 is a deficient number, since it is larger than the sum of its proper divisors (1).

7715686261 is an equidigital number, since it uses as much as digits as its factorization.

7715686261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 7715686261 is about 87838.9791664270. The cubic root of 7715686261 is about 1976.0208372967.

The spelling of 7715686261 in words is "seven billion, seven hundred fifteen million, six hundred eighty-six thousand, two hundred sixty-one".