655642667 has 2 divisors, whose sum is σ = 655642668. Its totient is φ = 655642666.

The previous prime is 655642651. The next prime is 655642693. The reversal of 655642667 is 766246556.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655642667 - 2⁴ = 655642651 is a prime.

It is not a weakly prime, because it can be changed into another prime (655642067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327821333 + 327821334.

It is an arithmetic number, because the mean of its divisors is an integer number (327821334).

Almost surely, 2^655642667 is an apocalyptic number.

655642667 is a deficient number, since it is larger than the sum of its proper divisors (1).

655642667 is an equidigital number, since it uses as much as digits as its factorization.

655642667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 47.

The square root of 655642667 is about 25605.5202446660. The cubic root of 655642667 is about 868.7385015679.

The spelling of 655642667 in words is "six hundred fifty-five million, six hundred forty-two thousand, six hundred sixty-seven".