663981267 has 8 divisors (see below), whose sum is σ = 904144896. Its totient is φ = 433235912.

The previous prime is 663981251. The next prime is 663981271. The reversal of 663981267 is 762189366.

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

It is a cyclic number.

It is not a de Polignac number, because 663981267 - 2⁴ = 663981251 is a prime.

It is a super-2 number, since 2×663981267² = 881742245853850578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663981217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2354403 + ... + 2354684.

It is an arithmetic number, because the mean of its divisors is an integer number (113018112).

Almost surely, 2^663981267 is an apocalyptic number.

663981267 is a deficient number, since it is larger than the sum of its proper divisors (240163629).

663981267 is a wasteful number, since it uses less digits than its factorization.

663981267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709137.

The product of its digits is 653184, while the sum is 48.

The square root of 663981267 is about 25767.8339601915. The cubic root of 663981267 is about 872.4059299297.

The spelling of 663981267 in words is "six hundred sixty-three million, nine hundred eighty-one thousand, two hundred sixty-seven".