663606001 has 4 divisors (see below), whose sum is σ = 663722100. Its totient is φ = 663489904.

The previous prime is 663605993. The next prime is 663606023. The reversal of 663606001 is 100606366.

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 529046001 + 134560000 = 23001^2 + 11600^2 .

It is a cyclic number.

It is not a de Polignac number, because 663606001 - 2³ = 663605993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663606091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49006 + ... + 61063.

It is an arithmetic number, because the mean of its divisors is an integer number (165930525).

Almost surely, 2^663606001 is an apocalyptic number.

It is an amenable number.

663606001 is a deficient number, since it is larger than the sum of its proper divisors (116099).

663606001 is a wasteful number, since it uses less digits than its factorization.

663606001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116098.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 663606001 is about 25760.5512557476. The cubic root of 663606001 is about 872.2415447801.

It can be divided in two parts, 66360 and 6001, that added together give a square (72361 = 269²).

The spelling of 663606001 in words is "six hundred sixty-three million, six hundred six thousand, one".