663982557 has 32 divisors (see below), whose sum is σ = 1036836864. Its totient is φ = 370137600.

The previous prime is 663982541. The next prime is 663982609. The reversal of 663982557 is 755289366.

It is a happy number.

It is not a de Polignac number, because 663982557 - 2⁴ = 663982541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663982507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142332 + ... + 146922.

It is an arithmetic number, because the mean of its divisors is an integer number (32401152).

Almost surely, 2^663982557 is an apocalyptic number.

It is an amenable number.

663982557 is a deficient number, since it is larger than the sum of its proper divisors (372854307).

663982557 is a wasteful number, since it uses less digits than its factorization.

663982557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4769.

The product of its digits is 2721600, while the sum is 51.

The square root of 663982557 is about 25767.8589913869. The cubic root of 663982557 is about 872.4064949069.

The spelling of 663982557 in words is "six hundred sixty-three million, nine hundred eighty-two thousand, five hundred fifty-seven".