663256042 has 8 divisors (see below), whose sum is σ = 1029190500. Its totient is φ = 320192544.

The previous prime is 663256021. The next prime is 663256049. The reversal of 663256042 is 240652366.

It can be written as a sum of positive squares in 2 ways, for example, as 635493681 + 27762361 = 25209^2 + 5269^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 663255989 and 663256007.

It is not an unprimeable number, because it can be changed into a prime (663256049) 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 3 ways as a sum of consecutive naturals, for example, 5717667 + ... + 5717782.

Almost surely, 2^663256042 is an apocalyptic number.

663256042 is a deficient number, since it is larger than the sum of its proper divisors (365934458).

663256042 is a wasteful number, since it uses less digits than its factorization.

663256042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11435480.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 663256042 is about 25753.7578228887. The cubic root of 663256042 is about 872.0881894997.

The spelling of 663256042 in words is "six hundred sixty-three million, two hundred fifty-six thousand, forty-two".