121685958480 has 40 divisors (see below), whose sum is σ = 377226472032. Its totient is φ = 32449588864.

The previous prime is 121685958461. The next prime is 121685958497. The reversal of 121685958480 is 84859586121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 121685958480.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253512174 + ... + 253512653.

Almost surely, 2^121685958480 is an apocalyptic number.

121685958480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121685958480 is an abundant number, since it is smaller than the sum of its proper divisors (255540513552).

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

121685958480 is a wasteful number, since it uses less digits than its factorization.

121685958480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507024843 (or 507024837 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 57.

The spelling of 121685958480 in words is "one hundred twenty-one billion, six hundred eighty-five million, nine hundred fifty-eight thousand, four hundred eighty".