121660255746 has 80 divisors (see below), whose sum is σ = 273861661920. Its totient is φ = 40367471040.

The previous prime is 121660255741. The next prime is 121660255789. The reversal of 121660255746 is 647552066121.

121660255746 is a `hidden beast` number, since 1 + 2 + 16 + 60 + 2 + 5 + 574 + 6 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121660255741) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 58237470 + ... + 58239558.

It is an arithmetic number, because the mean of its divisors is an integer number (3423270774).

Almost surely, 2^121660255746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121660255746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136930830960).

121660255746 is an abundant number, since it is smaller than the sum of its proper divisors (152201406174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121660255746 is a wasteful number, since it uses less digits than its factorization.

121660255746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581 (or 3572 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 121660255746 in words is "one hundred twenty-one billion, six hundred sixty million, two hundred fifty-five thousand, seven hundred forty-six".