166237720 has 64 divisors (see below), whose sum is σ = 414201600. Its totient is φ = 59537280.

The previous prime is 166237711. The next prime is 166237763. The reversal of 166237720 is 27732661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26661 + ... + 32299.

It is an arithmetic number, because the mean of its divisors is an integer number (6471900).

Almost surely, 2^166237720 is an apocalyptic number.

166237720 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 166237720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207100800).

166237720 is an abundant number, since it is smaller than the sum of its proper divisors (247963880).

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

166237720 is a wasteful number, since it uses less digits than its factorization.

166237720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728 (or 5724 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 166237720 is about 12893.3207514589. The cubic root of 166237720 is about 549.8486856474.

The spelling of 166237720 in words is "one hundred sixty-six million, two hundred thirty-seven thousand, seven hundred twenty".