121616611877 has 2 divisors, whose sum is σ = 121616611878. Its totient is φ = 121616611876.

The previous prime is 121616611817. The next prime is 121616611901. The reversal of 121616611877 is 778116616121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119583864481 + 2032747396 = 345809^2 + 45086^2 .

It is a cyclic number.

It is not a de Polignac number, because 121616611877 - 2⁸ = 121616611621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121616611817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60808305938 + 60808305939.

It is an arithmetic number, because the mean of its divisors is an integer number (60808305939).

Almost surely, 2^121616611877 is an apocalyptic number.

It is an amenable number.

121616611877 is a deficient number, since it is larger than the sum of its proper divisors (1).

121616611877 is an equidigital number, since it uses as much as digits as its factorization.

121616611877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 47.

The spelling of 121616611877 in words is "one hundred twenty-one billion, six hundred sixteen million, six hundred eleven thousand, eight hundred seventy-seven".