166251380929 has 2 divisors, whose sum is σ = 166251380930. Its totient is φ = 166251380928.

The previous prime is 166251380909. The next prime is 166251380957. The reversal of 166251380929 is 929083152661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156082675329 + 10168705600 = 395073^2 + 100840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166251380929 is a prime.

It is not a weakly prime, because it can be changed into another prime (166251380909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83125690464 + 83125690465.

It is an arithmetic number, because the mean of its divisors is an integer number (83125690465).

Almost surely, 2^166251380929 is an apocalyptic number.

It is an amenable number.

166251380929 is a deficient number, since it is larger than the sum of its proper divisors (1).

166251380929 is an equidigital number, since it uses as much as digits as its factorization.

166251380929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 166251380929 in words is "one hundred sixty-six billion, two hundred fifty-one million, three hundred eighty thousand, nine hundred twenty-nine".