63712652721 has 4 divisors (see below), whose sum is σ = 84950203632. Its totient is φ = 42475101812.

The previous prime is 63712652693. The next prime is 63712652723. The reversal of 63712652721 is 12725621736.

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 63712652721 - 2⁶ = 63712652657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63712652723) 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, 10618775451 + ... + 10618775456.

It is an arithmetic number, because the mean of its divisors is an integer number (21237550908).

Almost surely, 2^63712652721 is an apocalyptic number.

It is an amenable number.

63712652721 is a deficient number, since it is larger than the sum of its proper divisors (21237550911).

63712652721 is a wasteful number, since it uses less digits than its factorization.

63712652721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21237550910.

The product of its digits is 211680, while the sum is 42.

The spelling of 63712652721 in words is "sixty-three billion, seven hundred twelve million, six hundred fifty-two thousand, seven hundred twenty-one".