655667257 has 16 divisors (see below), whose sum is σ = 791101440. Its totient is φ = 530849808.

The previous prime is 655667213. The next prime is 655667261. The reversal of 655667257 is 752766556.

It is a cyclic number.

It is not a de Polignac number, because 655667257 - 2¹⁵ = 655634489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655667257.

It is not an unprimeable number, because it can be changed into a prime (655667297) 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 in 15 ways as a sum of consecutive naturals, for example, 39048 + ... + 53254.

It is an arithmetic number, because the mean of its divisors is an integer number (49443840).

Almost surely, 2^655667257 is an apocalyptic number.

It is an amenable number.

655667257 is a deficient number, since it is larger than the sum of its proper divisors (135434183).

655667257 is a wasteful number, since it uses less digits than its factorization.

655667257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14580.

The product of its digits is 2646000, while the sum is 49.

The square root of 655667257 is about 25606.0004100601. Note that the first 3 decimals coincide. The cubic root of 655667257 is about 868.7493621651.

The spelling of 655667257 in words is "six hundred fifty-five million, six hundred sixty-seven thousand, two hundred fifty-seven".