178729981122 has 192 divisors, whose sum is σ = 467227901952. Its totient is φ = 44567107200.

The previous prime is 178729981121. The next prime is 178729981123. The reversal of 178729981122 is 221189927871.

It is an interprime number because it is at equal distance from previous prime (178729981121) and next prime (178729981123).

It is not an unprimeable number, because it can be changed into a prime (178729981121) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20003368 + ... + 20012300.

It is an arithmetic number, because the mean of its divisors is an integer number (2433478656).

Almost surely, 2^178729981122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 178729981122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233613950976).

178729981122 is an abundant number, since it is smaller than the sum of its proper divisors (288497920830).

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

178729981122 is a wasteful number, since it uses less digits than its factorization.

178729981122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9125 (or 9114 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 57.

The spelling of 178729981122 in words is "one hundred seventy-eight billion, seven hundred twenty-nine million, nine hundred eighty-one thousand, one hundred twenty-two".