166681150429 has 2 divisors, whose sum is σ = 166681150430. Its totient is φ = 166681150428.

The previous prime is 166681150403. The next prime is 166681150457. The reversal of 166681150429 is 924051186661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166133684025 + 547466404 = 407595^2 + 23398^2 .

It is a cyclic number.

It is not a de Polignac number, because 166681150429 - 2¹³ = 166681142237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166681150829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83340575214 + 83340575215.

It is an arithmetic number, because the mean of its divisors is an integer number (83340575215).

Almost surely, 2^166681150429 is an apocalyptic number.

It is an amenable number.

166681150429 is a deficient number, since it is larger than the sum of its proper divisors (1).

166681150429 is an equidigital number, since it uses as much as digits as its factorization.

166681150429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 166681150429 in words is "one hundred sixty-six billion, six hundred eighty-one million, one hundred fifty thousand, four hundred twenty-nine".