166238667399 has 16 divisors (see below), whose sum is σ = 253368034560. Its totient is φ = 94974035520.

The previous prime is 166238667323. The next prime is 166238667421. The reversal of 166238667399 is 993766832661.

It is not a de Polignac number, because 166238667399 - 2⁸ = 166238667143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166238667319) 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 in 15 ways as a sum of consecutive naturals, for example, 706917 + ... + 912254.

It is an arithmetic number, because the mean of its divisors is an integer number (15835502160).

Almost surely, 2^166238667399 is an apocalyptic number.

166238667399 is a deficient number, since it is larger than the sum of its proper divisors (87129367161).

166238667399 is a wasteful number, since it uses less digits than its factorization.

166238667399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624070.

The product of its digits is 105815808, while the sum is 66.

The spelling of 166238667399 in words is "one hundred sixty-six billion, two hundred thirty-eight million, six hundred sixty-seven thousand, three hundred ninety-nine".