75997823981 has 2 divisors, whose sum is σ = 75997823982. Its totient is φ = 75997823980.

The previous prime is 75997823969. The next prime is 75997824031. The reversal of 75997823981 is 18932879957.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50514810025 + 25483013956 = 224755^2 + 159634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75997823981 is a prime.

It is a super-2 number, since 2×75997823981² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75997822981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37998911990 + 37998911991.

It is an arithmetic number, because the mean of its divisors is an integer number (37998911991).

Almost surely, 2^75997823981 is an apocalyptic number.

It is an amenable number.

75997823981 is a deficient number, since it is larger than the sum of its proper divisors (1).

75997823981 is an equidigital number, since it uses as much as digits as its factorization.

75997823981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 68.

The spelling of 75997823981 in words is "seventy-five billion, nine hundred ninety-seven million, eight hundred twenty-three thousand, nine hundred eighty-one".