74771639009 has 2 divisors, whose sum is σ = 74771639010. Its totient is φ = 74771639008.

The previous prime is 74771638987. The next prime is 74771639011. The reversal of 74771639009 is 90093617747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37576659409 + 37194979600 = 193847^2 + 192860^2 .

It is a cyclic number.

It is not a de Polignac number, because 74771639009 - 2²⁸ = 74503203553 is a prime.

Together with 74771639011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74771639309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37385819504 + 37385819505.

It is an arithmetic number, because the mean of its divisors is an integer number (37385819505).

Almost surely, 2^74771639009 is an apocalyptic number.

It is an amenable number.

74771639009 is a deficient number, since it is larger than the sum of its proper divisors (1).

74771639009 is an equidigital number, since it uses as much as digits as its factorization.

74771639009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000376, while the sum is 53.

The spelling of 74771639009 in words is "seventy-four billion, seven hundred seventy-one million, six hundred thirty-nine thousand, nine".