63821612657837 has 2 divisors, whose sum is σ = 63821612657838. Its totient is φ = 63821612657836.

The previous prime is 63821612657779. The next prime is 63821612657843. The reversal of 63821612657837 is 73875621612836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62710972788676 + 1110639869161 = 7919026^2 + 1053869^2 .

It is a cyclic number.

It is not a de Polignac number, because 63821612657837 - 2¹⁶ = 63821612592301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63821612650837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31910806328918 + 31910806328919.

It is an arithmetic number, because the mean of its divisors is an integer number (31910806328919).

Almost surely, 2^{63821612657837} is an apocalyptic number.

It is an amenable number.

63821612657837 is a deficient number, since it is larger than the sum of its proper divisors (1).

63821612657837 is an equidigital number, since it uses as much as digits as its factorization.

63821612657837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121927680, while the sum is 65.

The spelling of 63821612657837 in words is "sixty-three trillion, eight hundred twenty-one billion, six hundred twelve million, six hundred fifty-seven thousand, eight hundred thirty-seven".