8691961757 has 2 divisors, whose sum is σ = 8691961758. Its totient is φ = 8691961756.

The previous prime is 8691961697. The next prime is 8691961769. The reversal of 8691961757 is 7571691968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4850565316 + 3841396441 = 69646^2 + 61979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8691961757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8691961696 and 8691961705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8691961357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4345980878 + 4345980879.

It is an arithmetic number, because the mean of its divisors is an integer number (4345980879).

Almost surely, 2^8691961757 is an apocalyptic number.

It is an amenable number.

8691961757 is a deficient number, since it is larger than the sum of its proper divisors (1).

8691961757 is an equidigital number, since it uses as much as digits as its factorization.

8691961757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 59.

The square root of 8691961757 is about 93230.6910679096. The cubic root of 8691961757 is about 2056.0764982015.

The spelling of 8691961757 in words is "eight billion, six hundred ninety-one million, nine hundred sixty-one thousand, seven hundred fifty-seven".