661363503 has 8 divisors (see below), whose sum is σ = 884317488. Its totient is φ = 439659264.

The previous prime is 661363489. The next prime is 661363519. The reversal of 661363503 is 305363166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661363503 - 2¹⁰ = 661362479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661363523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311200 + ... + 313317.

It is an arithmetic number, because the mean of its divisors is an integer number (110539686).

Almost surely, 2^661363503 is an apocalyptic number.

661363503 is a deficient number, since it is larger than the sum of its proper divisors (222953985).

661363503 is a wasteful number, since it uses less digits than its factorization.

661363503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624873.

The product of its (nonzero) digits is 29160, while the sum is 33.

The square root of 661363503 is about 25716.9886067557. The cubic root of 661363503 is about 871.2579253128.

The spelling of 661363503 in words is "six hundred sixty-one million, three hundred sixty-three thousand, five hundred three".