166378571400 has 96 divisors (see below), whose sum is σ = 516212496000. Its totient is φ = 44329862400.

The previous prime is 166378571389. The next prime is 166378571467. The reversal of 166378571400 is 4175873661.

It is a super-2 number, since 2×166378571400² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166378571400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 591201 + ... + 825999.

It is an arithmetic number, because the mean of its divisors is an integer number (5377213500).

Almost surely, 2^166378571400 is an apocalyptic number.

166378571400 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 166378571400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258106248000).

166378571400 is an abundant number, since it is smaller than the sum of its proper divisors (349833924600).

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

166378571400 is a wasteful number, since it uses less digits than its factorization.

166378571400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235999 (or 235990 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 166378571400 in words is "one hundred sixty-six billion, three hundred seventy-eight million, five hundred seventy-one thousand, four hundred".