121778990065087 has 16 divisors (see below), whose sum is σ = 122303964045312. Its totient is φ = 121254907625280.

The previous prime is 121778990065049. The next prime is 121778990065129. The reversal of 121778990065087 is 780560099877121.

It is a cyclic number.

It is not a de Polignac number, because 121778990065087 - 2¹⁹ = 121778989540799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121778990065387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4965087018 + ... + 4965111544.

It is an arithmetic number, because the mean of its divisors is an integer number (7643997752832).

Almost surely, 2^{121778990065087} is an apocalyptic number.

121778990065087 is a deficient number, since it is larger than the sum of its proper divisors (524973980225).

121778990065087 is a wasteful number, since it uses less digits than its factorization.

121778990065087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41838.

The product of its (nonzero) digits is 106686720, while the sum is 70.

The spelling of 121778990065087 in words is "one hundred twenty-one trillion, seven hundred seventy-eight billion, nine hundred ninety million, sixty-five thousand, eighty-seven".