166537518 has 64 divisors (see below), whose sum is σ = 403673088. Its totient is φ = 44789760.

The previous prime is 166537499. The next prime is 166537523. The reversal of 166537518 is 815735661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 166537518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46446 + ... + 49902.

It is an arithmetic number, because the mean of its divisors is an integer number (6307392).

Almost surely, 2^166537518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166537518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201836544).

166537518 is an abundant number, since it is smaller than the sum of its proper divisors (237135570).

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

166537518 is a wasteful number, since it uses less digits than its factorization.

166537518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537.

The product of its digits is 151200, while the sum is 42.

The square root of 166537518 is about 12904.9416116463. The cubic root of 166537518 is about 550.1790249167.

The spelling of 166537518 in words is "one hundred sixty-six million, five hundred thirty-seven thousand, five hundred eighteen".