63720251771 has 24 divisors (see below), whose sum is σ = 70339869600. Its totient is φ = 57679776000.

The previous prime is 63720251743. The next prime is 63720251773. The reversal of 63720251771 is 17715202736.

It is not a de Polignac number, because 63720251771 - 2³⁴ = 46540382587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63720251773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44590085 + ... + 44591513.

It is an arithmetic number, because the mean of its divisors is an integer number (2930827900).

Almost surely, 2^63720251771 is an apocalyptic number.

63720251771 is a deficient number, since it is larger than the sum of its proper divisors (6619617829).

63720251771 is a wasteful number, since it uses less digits than its factorization.

63720251771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771 (or 2760 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 63720251771 in words is "sixty-three billion, seven hundred twenty million, two hundred fifty-one thousand, seven hundred seventy-one".