121678566400 has 132 divisors (see below), whose sum is σ = 302745732160. Its totient is φ = 48489062400.

The previous prime is 121678566323. The next prime is 121678566409. The reversal of 121678566400 is 4665876121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121678566409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6928831 + ... + 6946369.

Almost surely, 2^121678566400 is an apocalyptic number.

121678566400 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 121678566400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151372866080).

121678566400 is an abundant number, since it is smaller than the sum of its proper divisors (181067165760).

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

121678566400 is a wasteful number, since it uses less digits than its factorization.

121678566400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17840 (or 17817 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 121678566400 in words is "one hundred twenty-one billion, six hundred seventy-eight million, five hundred sixty-six thousand, four hundred".