663952601 has 4 divisors (see below), whose sum is σ = 715025892. Its totient is φ = 612879312.

The previous prime is 663952579. The next prime is 663952603. The reversal of 663952601 is 106259366.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48664576 + 615288025 = 6976^2 + 24805^2 .

It is a cyclic number.

It is not a de Polignac number, because 663952601 - 2¹⁸ = 663690457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663952603) 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, 25536626 + ... + 25536651.

It is an arithmetic number, because the mean of its divisors is an integer number (178756473).

Almost surely, 2^663952601 is an apocalyptic number.

It is an amenable number.

663952601 is a deficient number, since it is larger than the sum of its proper divisors (51073291).

663952601 is a wasteful number, since it uses less digits than its factorization.

663952601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51073290.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 663952601 is about 25767.2777180672. The cubic root of 663952601 is about 872.3933749830.

The spelling of 663952601 in words is "six hundred sixty-three million, nine hundred fifty-two thousand, six hundred one".