166500180031 has 2 divisors, whose sum is σ = 166500180032. Its totient is φ = 166500180030.

The previous prime is 166500180001. The next prime is 166500180053. The reversal of 166500180031 is 130081005661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166500180031 - 2⁵ = 166500179999 is a prime.

It is a super-2 number, since 2×166500180031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166500179975 and 166500180002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166500180001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83250090015 + 83250090016.

It is an arithmetic number, because the mean of its divisors is an integer number (83250090016).

Almost surely, 2^166500180031 is an apocalyptic number.

166500180031 is a deficient number, since it is larger than the sum of its proper divisors (1).

166500180031 is an equidigital number, since it uses as much as digits as its factorization.

166500180031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 166500180031 its reverse (130081005661), we get a palindrome (296581185692).

The spelling of 166500180031 in words is "one hundred sixty-six billion, five hundred million, one hundred eighty thousand, thirty-one".