63661321403 has 4 divisors (see below), whose sum is σ = 65714912448. Its totient is φ = 61607730360.

The previous prime is 63661321393. The next prime is 63661321429. The reversal of 63661321403 is 30412316636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63661321403 - 2³⁴ = 46481452219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63661321433) 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 3 ways as a sum of consecutive naturals, for example, 1026795476 + ... + 1026795537.

It is an arithmetic number, because the mean of its divisors is an integer number (16428728112).

Almost surely, 2^63661321403 is an apocalyptic number.

63661321403 is a deficient number, since it is larger than the sum of its proper divisors (2053591045).

63661321403 is a wasteful number, since it uses less digits than its factorization.

63661321403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053591044.

The product of its (nonzero) digits is 46656, while the sum is 35.

The spelling of 63661321403 in words is "sixty-three billion, six hundred sixty-one million, three hundred twenty-one thousand, four hundred three".