663867138 has 32 divisors (see below), whose sum is σ = 1449372672. Its totient is φ = 201042000.

The previous prime is 663867137. The next prime is 663867143. The reversal of 663867138 is 831768366.

It is a super-2 number, since 2×663867138² = 881439153832622088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663867133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166395 + ... + 170337.

It is an arithmetic number, because the mean of its divisors is an integer number (45292896).

Almost surely, 2^663867138 is an apocalyptic number.

663867138 is an abundant number, since it is smaller than the sum of its proper divisors (785505534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663867138 is a wasteful number, since it uses less digits than its factorization.

663867138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6510.

The product of its digits is 870912, while the sum is 48.

The square root of 663867138 is about 25765.6193016974. The cubic root of 663867138 is about 872.3559423138.

The spelling of 663867138 in words is "six hundred sixty-three million, eight hundred sixty-seven thousand, one hundred thirty-eight".