63193781993 has 2 divisors, whose sum is σ = 63193781994. Its totient is φ = 63193781992.

The previous prime is 63193781939. The next prime is 63193782019. The reversal of 63193781993 is 39918739136.

Together with previous prime (63193781939) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38238629209 + 24955152784 = 195547^2 + 157972^2 .

It is a cyclic number.

It is not a de Polignac number, because 63193781993 - 2¹⁶ = 63193716457 is a prime.

It is a super-2 number, since 2×63193781993² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (63193781923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31596890996 + 31596890997.

It is an arithmetic number, because the mean of its divisors is an integer number (31596890997).

Almost surely, 2^63193781993 is an apocalyptic number.

It is an amenable number.

63193781993 is a deficient number, since it is larger than the sum of its proper divisors (1).

63193781993 is an equidigital number, since it uses as much as digits as its factorization.

63193781993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6613488, while the sum is 59.

The spelling of 63193781993 in words is "sixty-three billion, one hundred ninety-three million, seven hundred eighty-one thousand, nine hundred ninety-three".