63452769521 has 4 divisors (see below), whose sum is σ = 63486867444. Its totient is φ = 63418671600.

The previous prime is 63452769503. The next prime is 63452769553. The reversal of 63452769521 is 12596725436.

63452769521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24921042496 + 38531727025 = 157864^2 + 196295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63452769521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63452769521.

It is not an unprimeable number, because it can be changed into a prime (63452769571) 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, 17046170 + ... + 17049891.

It is an arithmetic number, because the mean of its divisors is an integer number (15871716861).

Almost surely, 2^63452769521 is an apocalyptic number.

It is an amenable number.

63452769521 is a deficient number, since it is larger than the sum of its proper divisors (34097923).

63452769521 is a wasteful number, since it uses less digits than its factorization.

63452769521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34097922.

The product of its digits is 2721600, while the sum is 50.

The spelling of 63452769521 in words is "sixty-three billion, four hundred fifty-two million, seven hundred sixty-nine thousand, five hundred twenty-one".