662123257 has 2 divisors, whose sum is σ = 662123258. Its totient is φ = 662123256.

The previous prime is 662123221. The next prime is 662123299. The reversal of 662123257 is 752321266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 612265536 + 49857721 = 24744^2 + 7061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-662123257 is a prime.

It is not a weakly prime, because it can be changed into another prime (662123557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331061628 + 331061629.

It is an arithmetic number, because the mean of its divisors is an integer number (331061629).

Almost surely, 2^662123257 is an apocalyptic number.

It is an amenable number.

662123257 is a deficient number, since it is larger than the sum of its proper divisors (1).

662123257 is an equidigital number, since it uses as much as digits as its factorization.

662123257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 662123257 is about 25731.7558087279. The cubic root of 662123257 is about 871.5914223886.

The spelling of 662123257 in words is "six hundred sixty-two million, one hundred twenty-three thousand, two hundred fifty-seven".