77860852068121 has 2 divisors, whose sum is σ = 77860852068122. Its totient is φ = 77860852068120.

The previous prime is 77860852068017. The next prime is 77860852068137. The reversal of 77860852068121 is 12186025806877.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59668827193600 + 18192024874521 = 7724560^2 + 4265211^2 .

It is a cyclic number.

It is not a de Polignac number, because 77860852068121 - 2¹⁵ = 77860852035353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77860852068121.

It is not a weakly prime, because it can be changed into another prime (77860852068161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38930426034060 + 38930426034061.

It is an arithmetic number, because the mean of its divisors is an integer number (38930426034061).

Almost surely, 2^{77860852068121} is an apocalyptic number.

It is an amenable number.

77860852068121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77860852068121 is an equidigital number, since it uses as much as digits as its factorization.

77860852068121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18063360, while the sum is 61.

The spelling of 77860852068121 in words is "seventy-seven trillion, eight hundred sixty billion, eight hundred fifty-two million, sixty-eight thousand, one hundred twenty-one".