63821612657899 has 2 divisors, whose sum is σ = 63821612657900. Its totient is φ = 63821612657898.

The previous prime is 63821612657843. The next prime is 63821612657921. The reversal of 63821612657899 is 99875621612836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63821612657899 - 2¹⁹ = 63821612133611 is a prime.

It is not a weakly prime, because it can be changed into another prime (63821612657599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31910806328949 + 31910806328950.

It is an arithmetic number, because the mean of its divisors is an integer number (31910806328950).

Almost surely, 2^{63821612657899} is an apocalyptic number.

63821612657899 is a deficient number, since it is larger than the sum of its proper divisors (1).

63821612657899 is an equidigital number, since it uses as much as digits as its factorization.

63821612657899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470292480, while the sum is 73.

The spelling of 63821612657899 in words is "sixty-three trillion, eight hundred twenty-one billion, six hundred twelve million, six hundred fifty-seven thousand, eight hundred ninety-nine".