655918387 has 2 divisors, whose sum is σ = 655918388. Its totient is φ = 655918386.

The previous prime is 655918381. The next prime is 655918423. The reversal of 655918387 is 783819556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655918387 - 2¹⁹ = 655394099 is a prime.

It is not a weakly prime, because it can be changed into another prime (655918381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327959193 + 327959194.

It is an arithmetic number, because the mean of its divisors is an integer number (327959194).

Almost surely, 2^655918387 is an apocalyptic number.

655918387 is a deficient number, since it is larger than the sum of its proper divisors (1).

655918387 is an equidigital number, since it uses as much as digits as its factorization.

655918387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 52.

The square root of 655918387 is about 25610.9036740213. The cubic root of 655918387 is about 868.8602625122.

The spelling of 655918387 in words is "six hundred fifty-five million, nine hundred eighteen thousand, three hundred eighty-seven".