166802531217 has 32 divisors (see below), whose sum is σ = 269409722112. Its totient is φ = 89614608384.

The previous prime is 166802531177. The next prime is 166802531237. The reversal of 166802531217 is 712135208661.

It is a happy number.

It is not a de Polignac number, because 166802531217 - 2¹² = 166802527121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166802531237) 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, 95083 + ... + 585359.

It is an arithmetic number, because the mean of its divisors is an integer number (8419053816).

Almost surely, 2^166802531217 is an apocalyptic number.

166802531217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

166802531217 is a deficient number, since it is larger than the sum of its proper divisors (102607190895).

166802531217 is a wasteful number, since it uses less digits than its factorization.

166802531217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491257.

The product of its (nonzero) digits is 120960, while the sum is 42.

Adding to 166802531217 its reverse (712135208661), we get a palindrome (878937739878).

The spelling of 166802531217 in words is "one hundred sixty-six billion, eight hundred two million, five hundred thirty-one thousand, two hundred seventeen".