655776287 has 2 divisors, whose sum is σ = 655776288. Its totient is φ = 655776286.

The previous prime is 655776281. The next prime is 655776307. The reversal of 655776287 is 782677556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655776287 - 2⁶ = 655776223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655776281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327888143 + 327888144.

It is an arithmetic number, because the mean of its divisors is an integer number (327888144).

Almost surely, 2^655776287 is an apocalyptic number.

655776287 is a deficient number, since it is larger than the sum of its proper divisors (1).

655776287 is an equidigital number, since it uses as much as digits as its factorization.

655776287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4939200, while the sum is 53.

The square root of 655776287 is about 25608.1293147313. The cubic root of 655776287 is about 868.7975138722.

The spelling of 655776287 in words is "six hundred fifty-five million, seven hundred seventy-six thousand, two hundred eighty-seven".