166131436155 has 16 divisors (see below), whose sum is σ = 272994360864. Its totient is φ = 86208744960.

The previous prime is 166131436151. The next prime is 166131436217. The reversal of 166131436155 is 551634131661.

It is not a de Polignac number, because 166131436155 - 2² = 166131436151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166131436151) 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, 149667406 + ... + 149668515.

It is an arithmetic number, because the mean of its divisors is an integer number (17062147554).

Almost surely, 2^166131436155 is an apocalyptic number.

166131436155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166131436155 is a deficient number, since it is larger than the sum of its proper divisors (106862924709).

166131436155 is a wasteful number, since it uses less digits than its factorization.

166131436155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299335966.

The product of its digits is 194400, while the sum is 42.

The spelling of 166131436155 in words is "one hundred sixty-six billion, one hundred thirty-one million, four hundred thirty-six thousand, one hundred fifty-five".