121660255765 has 8 divisors (see below), whose sum is σ = 145999825920. Its totient is φ = 97323191952.

The previous prime is 121660255741. The next prime is 121660255789. The reversal of 121660255765 is 567552066121.

It is an interprime number because it is at equal distance from previous prime (121660255741) and next prime (121660255789).

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 121660255765 - 2¹³ = 121660247573 is a prime.

It is a congruent number.

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, 518085 + ... + 715354.

It is an arithmetic number, because the mean of its divisors is an integer number (18249978240).

Almost surely, 2^121660255765 is an apocalyptic number.

It is an amenable number.

121660255765 is a deficient number, since it is larger than the sum of its proper divisors (24339570155).

121660255765 is a wasteful number, since it uses less digits than its factorization.

121660255765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253171.

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

The spelling of 121660255765 in words is "one hundred twenty-one billion, six hundred sixty million, two hundred fifty-five thousand, seven hundred sixty-five".