76538886639221 has 2 divisors, whose sum is σ = 76538886639222. Its totient is φ = 76538886639220.

The previous prime is 76538886639211. The next prime is 76538886639223. The reversal of 76538886639221 is 12293668883567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75497852102500 + 1041034536721 = 8688950^2 + 1020311^2 .

It is a cyclic number.

It is not a de Polignac number, because 76538886639221 - 2³⁴ = 76521706770037 is a prime.

Together with 76538886639223, 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 (76538886639223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38269443319610 + 38269443319611.

It is an arithmetic number, because the mean of its divisors is an integer number (38269443319611).

Almost surely, 2^{76538886639221} is an apocalyptic number.

It is an amenable number.

76538886639221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76538886639221 is an equidigital number, since it uses as much as digits as its factorization.

76538886639221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1254113280, while the sum is 74.

The spelling of 76538886639221 in words is "seventy-six trillion, five hundred thirty-eight billion, eight hundred eighty-six million, six hundred thirty-nine thousand, two hundred twenty-one".