121755413665 has 8 divisors (see below), whose sum is σ = 146109113640. Its totient is φ = 97402586112.

The previous prime is 121755413657. The next prime is 121755413671. The reversal of 121755413665 is 566314557121.

It can be written as a sum of positive squares in 4 ways, for example, as 17860718736 + 103894694929 = 133644^2 + 322327^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121755413665 - 2³ = 121755413657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143407 + ... + 513883.

It is an arithmetic number, because the mean of its divisors is an integer number (18263639205).

Almost surely, 2^121755413665 is an apocalyptic number.

It is an amenable number.

121755413665 is a deficient number, since it is larger than the sum of its proper divisors (24353699975).

121755413665 is an equidigital number, since it uses as much as digits as its factorization.

121755413665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436211.

The product of its digits is 756000, while the sum is 46.

The spelling of 121755413665 in words is "one hundred twenty-one billion, seven hundred fifty-five million, four hundred thirteen thousand, six hundred sixty-five".