655971761 has 2 divisors, whose sum is σ = 655971762. Its totient is φ = 655971760.

The previous prime is 655971727. The next prime is 655971791. The reversal of 655971761 is 167179556.

655971761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 651219361 + 4752400 = 25519^2 + 2180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655971761 is a prime.

It is a super-2 number, since 2×655971761² = 860597902458882242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (655971721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327985880 + 327985881.

It is an arithmetic number, because the mean of its divisors is an integer number (327985881).

Almost surely, 2^655971761 is an apocalyptic number.

It is an amenable number.

655971761 is a deficient number, since it is larger than the sum of its proper divisors (1).

655971761 is an equidigital number, since it uses as much as digits as its factorization.

655971761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 47.

The square root of 655971761 is about 25611.9456699408. The cubic root of 655971761 is about 868.8838291077.

The spelling of 655971761 in words is "six hundred fifty-five million, nine hundred seventy-one thousand, seven hundred sixty-one".