6313777661 has 2 divisors, whose sum is σ = 6313777662. Its totient is φ = 6313777660.

The previous prime is 6313777651. The next prime is 6313777669. The reversal of 6313777661 is 1667773136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6101172100 + 212605561 = 78110^2 + 14581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6313777661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6313777669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3156888830 + 3156888831.

It is an arithmetic number, because the mean of its divisors is an integer number (3156888831).

Almost surely, 2^6313777661 is an apocalyptic number.

It is an amenable number.

6313777661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6313777661 is an equidigital number, since it uses as much as digits as its factorization.

6313777661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 47.

The square root of 6313777661 is about 79459.2830385475. The cubic root of 6313777661 is about 1848.2601281287.

The spelling of 6313777661 in words is "six billion, three hundred thirteen million, seven hundred seventy-seven thousand, six hundred sixty-one".