166722556 has 72 divisors (see below), whose sum is σ = 394015104. Its totient is φ = 59941440.

The previous prime is 166722547. The next prime is 166722559. The reversal of 166722556 is 655227661.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166722559) 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, 50451 + ... + 53653.

It is an arithmetic number, because the mean of its divisors is an integer number (5472432).

Almost surely, 2^166722556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166722556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197007552).

166722556 is an abundant number, since it is smaller than the sum of its proper divisors (227292548).

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

166722556 is a wasteful number, since it uses less digits than its factorization.

166722556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251 (or 3236 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 166722556 is about 12912.1088904950. The cubic root of 166722556 is about 550.3827154453.

The spelling of 166722556 in words is "one hundred sixty-six million, seven hundred twenty-two thousand, five hundred fifty-six".