76647506389 has 2 divisors, whose sum is σ = 76647506390. Its totient is φ = 76647506388.

The previous prime is 76647506363. The next prime is 76647506431. The reversal of 76647506389 is 98360574667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75932211364 + 715295025 = 275558^2 + 26745^2 .

It is a cyclic number.

It is not a de Polignac number, because 76647506389 - 2⁵ = 76647506357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76647506359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38323753194 + 38323753195.

It is an arithmetic number, because the mean of its divisors is an integer number (38323753195).

Almost surely, 2^76647506389 is an apocalyptic number.

It is an amenable number.

76647506389 is a deficient number, since it is larger than the sum of its proper divisors (1).

76647506389 is an equidigital number, since it uses as much as digits as its factorization.

76647506389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 61.

The spelling of 76647506389 in words is "seventy-six billion, six hundred forty-seven million, five hundred six thousand, three hundred eighty-nine".