63636126522421 has 4 divisors (see below), whose sum is σ = 63636436481644. Its totient is φ = 63635816563200.

The previous prime is 63636126522403. The next prime is 63636126522443. The reversal of 63636126522421 is 12422562163636.

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 7072355172100 + 56563771350321 = 2659390^2 + 7520889^2 .

It is a cyclic number.

It is not a de Polignac number, because 63636126522421 - 2¹³ = 63636126514229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63636126523421) 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, 154671450 + ... + 155082331.

It is an arithmetic number, because the mean of its divisors is an integer number (15909109120411).

Almost surely, 2^{63636126522421} is an apocalyptic number.

It is an amenable number.

63636126522421 is a deficient number, since it is larger than the sum of its proper divisors (309959223).

63636126522421 is a wasteful number, since it uses less digits than its factorization.

63636126522421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309959222.

The product of its digits is 3732480, while the sum is 49.

The spelling of 63636126522421 in words is "sixty-three trillion, six hundred thirty-six billion, one hundred twenty-six million, five hundred twenty-two thousand, four hundred twenty-one".