74408662781 has 2 divisors, whose sum is σ = 74408662782. Its totient is φ = 74408662780.

The previous prime is 74408662747. The next prime is 74408662787. The reversal of 74408662781 is 18726680447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46024837156 + 28383825625 = 214534^2 + 168475^2 .

It is a cyclic number.

It is not a de Polignac number, because 74408662781 - 2²² = 74404468477 is a prime.

It is a super-2 number, since 2×74408662781² (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 (74408662787) 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, 37204331390 + 37204331391.

It is an arithmetic number, because the mean of its divisors is an integer number (37204331391).

Almost surely, 2^74408662781 is an apocalyptic number.

It is an amenable number.

74408662781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74408662781 is an equidigital number, since it uses as much as digits as its factorization.

74408662781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3612672, while the sum is 53.

The spelling of 74408662781 in words is "seventy-four billion, four hundred eight million, six hundred sixty-two thousand, seven hundred eighty-one".