655967399 has 2 divisors, whose sum is σ = 655967400. Its totient is φ = 655967398.

The previous prime is 655967363. The next prime is 655967401. The reversal of 655967399 is 993769556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655967399 - 2²⁸ = 387531943 is a prime.

Together with 655967401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655967309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327983699 + 327983700.

It is an arithmetic number, because the mean of its divisors is an integer number (327983700).

Almost surely, 2^655967399 is an apocalyptic number.

655967399 is a deficient number, since it is larger than the sum of its proper divisors (1).

655967399 is an equidigital number, since it uses as much as digits as its factorization.

655967399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13778100, while the sum is 59.

The square root of 655967399 is about 25611.8605142227. The cubic root of 655967399 is about 868.8819031713.

The spelling of 655967399 in words is "six hundred fifty-five million, nine hundred sixty-seven thousand, three hundred ninety-nine".