663537541 has 4 divisors (see below), whose sum is σ = 674784000. Its totient is φ = 652291084.

The previous prime is 663537517. The next prime is 663537569. The reversal of 663537541 is 145735366.

663537541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663537541 - 2⁵ = 663537509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663537494 and 663537503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663537841) 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, 5623141 + ... + 5623258.

It is an arithmetic number, because the mean of its divisors is an integer number (168696000).

Almost surely, 2^663537541 is an apocalyptic number.

It is an amenable number.

663537541 is a deficient number, since it is larger than the sum of its proper divisors (11246459).

663537541 is a wasteful number, since it uses less digits than its factorization.

663537541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11246458.

The product of its digits is 226800, while the sum is 40.

The square root of 663537541 is about 25759.2224455631. Note that the first 3 decimals coincide. The cubic root of 663537541 is about 872.2115492157.

The spelling of 663537541 in words is "six hundred sixty-three million, five hundred thirty-seven thousand, five hundred forty-one".