74511205981 has 2 divisors, whose sum is σ = 74511205982. Its totient is φ = 74511205980.

The previous prime is 74511205963. The next prime is 74511205997. The reversal of 74511205981 is 18950211547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60151977081 + 14359228900 = 245259^2 + 119830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74511205981 is a prime.

It is a super-2 number, since 2×74511205981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74511205081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37255602990 + 37255602991.

It is an arithmetic number, because the mean of its divisors is an integer number (37255602991).

Almost surely, 2^74511205981 is an apocalyptic number.

It is an amenable number.

74511205981 is a deficient number, since it is larger than the sum of its proper divisors (1).

74511205981 is an equidigital number, since it uses as much as digits as its factorization.

74511205981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 74511205981 in words is "seventy-four billion, five hundred eleven million, two hundred five thousand, nine hundred eighty-one".