63521473867 has 16 divisors (see below), whose sum is σ = 65418941952. Its totient is φ = 61633807200.

The previous prime is 63521473861. The next prime is 63521473871. The reversal of 63521473867 is 76837412536.

63521473867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 63521473867 - 2³ = 63521473859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63521473861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27017742 + ... + 27020092.

It is an arithmetic number, because the mean of its divisors is an integer number (4088683872).

Almost surely, 2^63521473867 is an apocalyptic number.

63521473867 is a deficient number, since it is larger than the sum of its proper divisors (1897468085).

63521473867 is a wasteful number, since it uses less digits than its factorization.

63521473867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098.

The product of its digits is 5080320, while the sum is 52.

The spelling of 63521473867 in words is "sixty-three billion, five hundred twenty-one million, four hundred seventy-three thousand, eight hundred sixty-seven".