121761635477 has 2 divisors, whose sum is σ = 121761635478. Its totient is φ = 121761635476.

The previous prime is 121761635419. The next prime is 121761635563. The reversal of 121761635477 is 774536167121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117859009636 + 3902625841 = 343306^2 + 62471^2 .

It is a cyclic number.

It is not a de Polignac number, because 121761635477 - 2¹⁸ = 121761373333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121761635417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60880817738 + 60880817739.

It is an arithmetic number, because the mean of its divisors is an integer number (60880817739).

Almost surely, 2^121761635477 is an apocalyptic number.

It is an amenable number.

121761635477 is a deficient number, since it is larger than the sum of its proper divisors (1).

121761635477 is an equidigital number, since it uses as much as digits as its factorization.

121761635477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481760, while the sum is 50.

The spelling of 121761635477 in words is "one hundred twenty-one billion, seven hundred sixty-one million, six hundred thirty-five thousand, four hundred seventy-seven".