1663612501 has 4 divisors (see below), whose sum is σ = 1664162604. Its totient is φ = 1663062400.

The previous prime is 1663612453. The next prime is 1663612523. The reversal of 1663612501 is 1052163661.

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 1574026276 + 89586225 = 39674^2 + 9465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663612501 - 2¹¹ = 1663610453 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663612001) 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, 270490 + ... + 276571.

It is an arithmetic number, because the mean of its divisors is an integer number (416040651).

Almost surely, 2^1663612501 is an apocalyptic number.

It is an amenable number.

1663612501 is a deficient number, since it is larger than the sum of its proper divisors (550103).

1663612501 is an equidigital number, since it uses as much as digits as its factorization.

1663612501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550102.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1663612501 is about 40787.4061568029. The cubic root of 1663612501 is about 1184.9064359058.

The spelling of 1663612501 in words is "one billion, six hundred sixty-three million, six hundred twelve thousand, five hundred one".