663957 has 20 divisors (see below), whose sum is σ = 1134496. Its totient is φ = 379080.

The previous prime is 663937. The next prime is 663959. The reversal of 663957 is 759366.

It is a happy number.

It is not a de Polignac number, because 663957 - 2⁶ = 663893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663959) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19 + ... + 1152.

2⁶⁶³⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

663957 is a deficient number, since it is larger than the sum of its proper divisors (470539).

663957 is a wasteful number, since it uses less digits than its factorization.

663957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190 (or 1181 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 663957 is about 814.8355662341. The cubic root of 663957 is about 87.2395301652.

It can be divided in two parts, 66 and 3957, that multiplied together give a palindrome (261162).

The spelling of 663957 in words is "six hundred sixty-three thousand, nine hundred fifty-seven".