667222757 has 2 divisors, whose sum is σ = 667222758. Its totient is φ = 667222756.

The previous prime is 667222747. The next prime is 667222793. The reversal of 667222757 is 757222766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 560079556 + 107143201 = 23666^2 + 10351^2 .

It is a cyclic number.

It is not a de Polignac number, because 667222757 - 2⁴ = 667222741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667222727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333611378 + 333611379.

It is an arithmetic number, because the mean of its divisors is an integer number (333611379).

Almost surely, 2^667222757 is an apocalyptic number.

It is an amenable number.

667222757 is a deficient number, since it is larger than the sum of its proper divisors (1).

667222757 is an equidigital number, since it uses as much as digits as its factorization.

667222757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 44.

The square root of 667222757 is about 25830.6553730253. The cubic root of 667222757 is about 873.8232920578.

Subtracting 667222757 from its reverse (757222766), we obtain a palindrome (90000009).

The spelling of 667222757 in words is "six hundred sixty-seven million, two hundred twenty-two thousand, seven hundred fifty-seven".