61663903 has 12 divisors (see below), whose sum is σ = 72718320. Its totient is φ = 52127712.

The previous prime is 61663883. The next prime is 61663907. The reversal of 61663903 is 30936616.

It is a happy number.

It is not a de Polignac number, because 61663903 - 2⁵ = 61663871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61663907) 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 11 ways as a sum of consecutive naturals, for example, 5043 + ... + 12196.

It is an arithmetic number, because the mean of its divisors is an integer number (6059860).

Almost surely, 2^61663903 is an apocalyptic number.

61663903 is a deficient number, since it is larger than the sum of its proper divisors (11054417).

61663903 is a wasteful number, since it uses less digits than its factorization.

61663903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17326 (or 17319 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 61663903 is about 7852.6366909466. The cubic root of 61663903 is about 395.0726843759.

The spelling of 61663903 in words is "sixty-one million, six hundred sixty-three thousand, nine hundred three".