663254761 has 8 divisors (see below), whose sum is σ = 717396680. Its totient is φ = 609558912.

The previous prime is 663254719. The next prime is 663254797. The reversal of 663254761 is 167452366.

It can be written as a sum of positive squares in 4 ways, for example, as 370331536 + 292923225 = 19244^2 + 17115^2 .

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 663254761 - 2¹³ = 663246569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663254161) 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, 108420 + ... + 114373.

It is an arithmetic number, because the mean of its divisors is an integer number (89674585).

Almost surely, 2^663254761 is an apocalyptic number.

It is an amenable number.

663254761 is a deficient number, since it is larger than the sum of its proper divisors (54141919).

663254761 is a wasteful number, since it uses less digits than its factorization.

663254761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223035.

The product of its digits is 181440, while the sum is 40.

The square root of 663254761 is about 25753.7329527197. The cubic root of 663254761 is about 872.0876280546.

The spelling of 663254761 in words is "six hundred sixty-three million, two hundred fifty-four thousand, seven hundred sixty-one".