166878065288440 has 128 divisors (see below), whose sum is σ = 411234167877120. Its totient is φ = 60442630617600.

The previous prime is 166878065288357. The next prime is 166878065288489. The reversal of 166878065288440 is 44882560878661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154276362 + ... + 155354278.

It is an arithmetic number, because the mean of its divisors is an integer number (3212766936540).

Almost surely, 2^{166878065288440} is an apocalyptic number.

166878065288440 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 166878065288440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205617083938560).

166878065288440 is an abundant number, since it is smaller than the sum of its proper divisors (244356102588680).

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

166878065288440 is a wasteful number, since it uses less digits than its factorization.

166878065288440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079333 (or 1079329 counting only the distinct ones).

The product of its (nonzero) digits is 990904320, while the sum is 73.

The spelling of 166878065288440 in words is "one hundred sixty-six trillion, eight hundred seventy-eight billion, sixty-five million, two hundred eighty-eight thousand, four hundred forty".