63481790721 has 4 divisors (see below), whose sum is σ = 84642387632. Its totient is φ = 42321193812.

The previous prime is 63481790717. The next prime is 63481790789. The reversal of 63481790721 is 12709718436.

It is a happy number.

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 not a de Polignac number, because 63481790721 - 2² = 63481790717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63481790791) 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 3 ways as a sum of consecutive naturals, for example, 10580298451 + ... + 10580298456.

It is an arithmetic number, because the mean of its divisors is an integer number (21160596908).

Almost surely, 2^63481790721 is an apocalyptic number.

It is an amenable number.

63481790721 is a deficient number, since it is larger than the sum of its proper divisors (21160596911).

63481790721 is a wasteful number, since it uses less digits than its factorization.

63481790721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21160596910.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 63481790721 in words is "sixty-three billion, four hundred eighty-one million, seven hundred ninety thousand, seven hundred twenty-one".