73989780509 has 2 divisors, whose sum is σ = 73989780510. Its totient is φ = 73989780508.

The previous prime is 73989780479. The next prime is 73989780511. The reversal of 73989780509 is 90508798937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65230692409 + 8759088100 = 255403^2 + 93590^2 .

It is a cyclic number.

It is not a de Polignac number, because 73989780509 - 2¹⁶ = 73989714973 is a prime.

Together with 73989780511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73989780559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36994890254 + 36994890255.

It is an arithmetic number, because the mean of its divisors is an integer number (36994890255).

Almost surely, 2^73989780509 is an apocalyptic number.

It is an amenable number.

73989780509 is a deficient number, since it is larger than the sum of its proper divisors (1).

73989780509 is an equidigital number, since it uses as much as digits as its factorization.

73989780509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34292160, while the sum is 65.

The spelling of 73989780509 in words is "seventy-three billion, nine hundred eighty-nine million, seven hundred eighty thousand, five hundred nine".