121556174560 has 96 divisors (see below), whose sum is σ = 288959946912. Its totient is φ = 48321331200.

The previous prime is 121556174557. The next prime is 121556174561. The reversal of 121556174560 is 65471655121.

It is a happy number.

It is a super-2 number, since 2×121556174560² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121556174561) 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, 21507735 + ... + 21513385.

It is an arithmetic number, because the mean of its divisors is an integer number (3009999447).

Almost surely, 2^121556174560 is an apocalyptic number.

121556174560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121556174560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144479973456).

121556174560 is an abundant number, since it is smaller than the sum of its proper divisors (167403772352).

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

121556174560 is a wasteful number, since it uses less digits than its factorization.

121556174560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6476 (or 6468 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 121556174560 in words is "one hundred twenty-one billion, five hundred fifty-six million, one hundred seventy-four thousand, five hundred sixty".