63821612657853 has 12 divisors (see below), whose sum is σ = 92189783238748. Its totient is φ = 42546352818240.

The previous prime is 63821612657843. The next prime is 63821612657899. The reversal of 63821612657853 is 35875621612836.

63821612657853 is a `hidden beast` number, since 6 + 3 + 8 + 2 + 1 + 6 + 1 + 2 + 6 + 578 + 53 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 59327628168249 + 4493984489604 = 7702443^2 + 2119902^2 .

It is not a de Polignac number, because 63821612657853 - 2⁴ = 63821612657837 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 (63821612657843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115455088 + ... + 116006553.

Almost surely, 2^{63821612657853} is an apocalyptic number.

It is an amenable number.

63821612657853 is a deficient number, since it is larger than the sum of its proper divisors (28368170580895).

63821612657853 is a wasteful number, since it uses less digits than its factorization.

63821612657853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231492284 (or 231492281 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 63.

The spelling of 63821612657853 in words is "sixty-three trillion, eight hundred twenty-one billion, six hundred twelve million, six hundred fifty-seven thousand, eight hundred fifty-three".