166181163405 has 32 divisors (see below), whose sum is σ = 275131416960. Its totient is φ = 85551056640.

The previous prime is 166181163403. The next prime is 166181163419. The reversal of 166181163405 is 504361181661.

It is a happy number.

It is not a de Polignac number, because 166181163405 - 2¹ = 166181163403 is a prime.

It is a super-2 number, since 2×166181163405² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166181163403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1657815 + ... + 1755195.

It is an arithmetic number, because the mean of its divisors is an integer number (8597856780).

Almost surely, 2^166181163405 is an apocalyptic number.

166181163405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166181163405 is a deficient number, since it is larger than the sum of its proper divisors (108950253555).

166181163405 is a wasteful number, since it uses less digits than its factorization.

166181163405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101341.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 166181163405 in words is "one hundred sixty-six billion, one hundred eighty-one million, one hundred sixty-three thousand, four hundred five".