56876404677221 has 2 divisors, whose sum is σ = 56876404677222. Its totient is φ = 56876404677220.

The previous prime is 56876404677119. The next prime is 56876404677227. The reversal of 56876404677221 is 12277640467865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56872502800996 + 3901876225 = 7541386^2 + 62465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56876404677221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56876404677227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28438202338610 + 28438202338611.

It is an arithmetic number, because the mean of its divisors is an integer number (28438202338611).

Almost surely, 2^{56876404677221} is an apocalyptic number.

It is an amenable number.

56876404677221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56876404677221 is an equidigital number, since it uses as much as digits as its factorization.

56876404677221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189665280, while the sum is 65.

The spelling of 56876404677221 in words is "fifty-six trillion, eight hundred seventy-six billion, four hundred four million, six hundred seventy-seven thousand, two hundred twenty-one".