76721363417 has 2 divisors, whose sum is σ = 76721363418. Its totient is φ = 76721363416.

The previous prime is 76721363377. The next prime is 76721363429. The reversal of 76721363417 is 71436312767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60856449481 + 15864913936 = 246691^2 + 125956^2 .

It is a cyclic number.

It is not a de Polignac number, because 76721363417 - 2⁶ = 76721363353 is a prime.

It is not a weakly prime, because it can be changed into another prime (76721363617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38360681708 + 38360681709.

It is an arithmetic number, because the mean of its divisors is an integer number (38360681709).

Almost surely, 2^76721363417 is an apocalyptic number.

It is an amenable number.

76721363417 is a deficient number, since it is larger than the sum of its proper divisors (1).

76721363417 is an equidigital number, since it uses as much as digits as its factorization.

76721363417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 47.

The spelling of 76721363417 in words is "seventy-six billion, seven hundred twenty-one million, three hundred sixty-three thousand, four hundred seventeen".