663626249 has 16 divisors (see below), whose sum is σ = 780603264. Its totient is φ = 556204800.

The previous prime is 663626189. The next prime is 663626261. The reversal of 663626249 is 942626366.

It is a cyclic number.

It is not a de Polignac number, because 663626249 - 2⁸ = 663625993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (663626549) 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, 138209 + ... + 142929.

It is an arithmetic number, because the mean of its divisors is an integer number (48787704).

Almost surely, 2^663626249 is an apocalyptic number.

It is an amenable number.

663626249 is a deficient number, since it is larger than the sum of its proper divisors (116977015).

663626249 is a wasteful number, since it uses less digits than its factorization.

663626249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728.

The product of its digits is 559872, while the sum is 44.

The square root of 663626249 is about 25760.9442567620. The cubic root of 663626249 is about 872.2504159914.

The spelling of 663626249 in words is "six hundred sixty-three million, six hundred twenty-six thousand, two hundred forty-nine".