166161400000 has 168 divisors, whose sum is σ = 436383757152. Its totient is φ = 62553600000.

The previous prime is 166161399977. The next prime is 166161400001. The reversal of 166161400000 is 4161661.

It is a super-2 number, since 2×166161400000² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (166161400001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3375565 + ... + 3424435.

It is an arithmetic number, because the mean of its divisors is an integer number (2597522364).

Almost surely, 2^166161400000 is an apocalyptic number.

166161400000 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 166161400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218191878576).

166161400000 is an abundant number, since it is smaller than the sum of its proper divisors (270222357152).

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

166161400000 is an frugal number, since it uses more digits than its factorization.

166161400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48925 (or 48895 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 166161400000 its reverse (4161661), we get a palindrome (166165561661).

The spelling of 166161400000 in words is "one hundred sixty-six billion, one hundred sixty-one million, four hundred thousand".