655764761 has 2 divisors, whose sum is σ = 655764762. Its totient is φ = 655764760.

The previous prime is 655764743. The next prime is 655764787. The reversal of 655764761 is 167467556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616777225 + 38987536 = 24835^2 + 6244^2 .

It is a cyclic number.

It is not a de Polignac number, because 655764761 - 2¹⁰ = 655763737 is a prime.

It is not a weakly prime, because it can be changed into another prime (655764721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327882380 + 327882381.

It is an arithmetic number, because the mean of its divisors is an integer number (327882381).

Almost surely, 2^655764761 is an apocalyptic number.

It is an amenable number.

655764761 is a deficient number, since it is larger than the sum of its proper divisors (1).

655764761 is an equidigital number, since it uses as much as digits as its factorization.

655764761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 47.

The square root of 655764761 is about 25607.9042680185. The cubic root of 655764761 is about 868.7924238138.

The spelling of 655764761 in words is "six hundred fifty-five million, seven hundred sixty-four thousand, seven hundred sixty-one".