166724781600 has 576 divisors, whose sum is σ = 610798406400. Its totient is φ = 39218135040.

The previous prime is 166724781599. The next prime is 166724781637. The reversal of 166724781600 is 6187427661.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 166724781600.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 93193506 + ... + 93195294.

It is an arithmetic number, because the mean of its divisors is an integer number (1060413900).

Almost surely, 2^166724781600 is an apocalyptic number.

166724781600 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 166724781600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305399203200).

166724781600 is an abundant number, since it is smaller than the sum of its proper divisors (444073624800).

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

166724781600 is a wasteful number, since it uses less digits than its factorization.

166724781600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957 (or 1944 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 166724781600 in words is "one hundred sixty-six billion, seven hundred twenty-four million, seven hundred eighty-one thousand, six hundred".