63743735981 has 2 divisors, whose sum is σ = 63743735982. Its totient is φ = 63743735980.

The previous prime is 63743735921. The next prime is 63743736011. The reversal of 63743735981 is 18953734736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50127179881 + 13616556100 = 223891^2 + 116690^2 .

It is a cyclic number.

It is not a de Polignac number, because 63743735981 - 2¹⁴ = 63743719597 is a prime.

It is a super-2 number, since 2×63743735981² (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 (63743735921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31871867990 + 31871867991.

It is an arithmetic number, because the mean of its divisors is an integer number (31871867991).

Almost surely, 2^63743735981 is an apocalyptic number.

It is an amenable number.

63743735981 is a deficient number, since it is larger than the sum of its proper divisors (1).

63743735981 is an equidigital number, since it uses as much as digits as its factorization.

63743735981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 56.

The spelling of 63743735981 in words is "sixty-three billion, seven hundred forty-three million, seven hundred thirty-five thousand, nine hundred eighty-one".