166726166440 has 64 divisors (see below), whose sum is σ = 377915706000. Its totient is φ = 66196549632.

The previous prime is 166726166407. The next prime is 166726166441. The reversal of 166726166440 is 44661627661.

166726166440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 41754018244 + 124972148196 = 204338^2 + 353514^2 .

It is a super-2 number, since 2×166726166440² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166726166441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9246874 + ... + 9264886.

Almost surely, 2^166726166440 is an apocalyptic number.

166726166440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166726166440 is an abundant number, since it is smaller than the sum of its proper divisors (211189539560).

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

166726166440 is a wasteful number, since it uses less digits than its factorization.

166726166440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19726 (or 19722 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 49.

It can be divided in two parts, 16672616 and 6440, that added together give a square (16679056 = 4084²).

The spelling of 166726166440 in words is "one hundred sixty-six billion, seven hundred twenty-six million, one hundred sixty-six thousand, four hundred forty".