663612501 has 32 divisors (see below), whose sum is σ = 924899328. Its totient is φ = 422876160.

The previous prime is 663612497. The next prime is 663612517. The reversal of 663612501 is 105216366.

It is not a de Polignac number, because 663612501 - 2² = 663612497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663612581) 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 31 ways as a sum of consecutive naturals, for example, 2395575 + ... + 2395851.

It is an arithmetic number, because the mean of its divisors is an integer number (28903104).

Almost surely, 2^663612501 is an apocalyptic number.

It is an amenable number.

663612501 is a deficient number, since it is larger than the sum of its proper divisors (261286827).

663612501 is a wasteful number, since it uses less digits than its factorization.

663612501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 663612501 is about 25760.6774173351. The cubic root of 663612501 is about 872.2443926304.

Adding to 663612501 its reverse (105216366), we get a palindrome (768828867).

The spelling of 663612501 in words is "six hundred sixty-three million, six hundred twelve thousand, five hundred one".