663573647 has 4 divisors (see below), whose sum is σ = 723898536. Its totient is φ = 603248760.

The previous prime is 663573641. The next prime is 663573653. The reversal of 663573647 is 746375366.

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

It is an interprime number because it is at equal distance from previous prime (663573641) and next prime (663573653).

It is a cyclic number.

It is not a de Polignac number, because 663573647 - 2¹⁸ = 663311503 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 (663573641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30162428 + ... + 30162449.

It is an arithmetic number, because the mean of its divisors is an integer number (180974634).

Almost surely, 2^663573647 is an apocalyptic number.

663573647 is a deficient number, since it is larger than the sum of its proper divisors (60324889).

663573647 is a wasteful number, since it uses less digits than its factorization.

663573647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60324888.

The product of its digits is 1905120, while the sum is 47.

The square root of 663573647 is about 25759.9232724013. The cubic root of 663573647 is about 872.2273692194.

The spelling of 663573647 in words is "six hundred sixty-three million, five hundred seventy-three thousand, six hundred forty-seven".