63316235981 has 2 divisors, whose sum is σ = 63316235982. Its totient is φ = 63316235980.

The previous prime is 63316235959. The next prime is 63316236013. The reversal of 63316235981 is 18953261336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63156213481 + 160022500 = 251309^2 + 12650^2 .

It is a cyclic number.

It is not a de Polignac number, because 63316235981 - 2¹⁴ = 63316219597 is a prime.

It is a super-2 number, since 2×63316235981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63316235921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31658117990 + 31658117991.

It is an arithmetic number, because the mean of its divisors is an integer number (31658117991).

Almost surely, 2^63316235981 is an apocalyptic number.

It is an amenable number.

63316235981 is a deficient number, since it is larger than the sum of its proper divisors (1).

63316235981 is an equidigital number, since it uses as much as digits as its factorization.

63316235981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 47.

The spelling of 63316235981 in words is "sixty-three billion, three hundred sixteen million, two hundred thirty-five thousand, nine hundred eighty-one".