663225551 has 4 divisors (see below), whose sum is σ = 663624600. Its totient is φ = 662826504.

The previous prime is 663225547. The next prime is 663225559. The reversal of 663225551 is 155522366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 663225551 - 2² = 663225547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663225559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197021 + ... + 200358.

It is an arithmetic number, because the mean of its divisors is an integer number (165906150).

Almost surely, 2^663225551 is an apocalyptic number.

663225551 is a deficient number, since it is larger than the sum of its proper divisors (399049).

663225551 is a wasteful number, since it uses less digits than its factorization.

663225551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399048.

The product of its digits is 54000, while the sum is 35.

The square root of 663225551 is about 25753.1658442219. The cubic root of 663225551 is about 872.0748255061.

The spelling of 663225551 in words is "six hundred sixty-three million, two hundred twenty-five thousand, five hundred fifty-one".