121755746655 has 24 divisors (see below), whose sum is σ = 211215951648. Its totient is φ = 64883272896.

The previous prime is 121755746627. The next prime is 121755746659. The reversal of 121755746655 is 556647557121.

121755746655 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 5 + 574 + 6 + 65 + 5 = 666.

It is not a de Polignac number, because 121755746655 - 2¹³ = 121755738463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121755746659) 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 in 23 ways as a sum of consecutive naturals, for example, 1051132 + ... + 1161201.

It is an arithmetic number, because the mean of its divisors is an integer number (8800664652).

Almost surely, 2^121755746655 is an apocalyptic number.

121755746655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121755746655 is a deficient number, since it is larger than the sum of its proper divisors (89460204993).

121755746655 is a wasteful number, since it uses less digits than its factorization.

121755746655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213567 (or 2213564 counting only the distinct ones).

The product of its digits is 8820000, while the sum is 54.

The spelling of 121755746655 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred forty-six thousand, six hundred fifty-five".