166006401799 has 6 divisors (see below), whose sum is σ = 193109487864. Its totient is φ = 142291201500.

The previous prime is 166006401791. The next prime is 166006401839. The reversal of 166006401799 is 997104600661.

It is not a de Polignac number, because 166006401799 - 2³ = 166006401791 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 3387885751 = 166006401799 / (1 + 6 + 6 + 0 + 0 + 6 + 4 + 0 + 1 + 7 + 9 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166006401791) 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 5 ways as a sum of consecutive naturals, for example, 1693942827 + ... + 1693942924.

It is an arithmetic number, because the mean of its divisors is an integer number (32184914644).

Almost surely, 2^166006401799 is an apocalyptic number.

166006401799 is a deficient number, since it is larger than the sum of its proper divisors (27103086065).

166006401799 is an equidigital number, since it uses as much as digits as its factorization.

166006401799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387885765 (or 3387885758 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 166006401799 in words is "one hundred sixty-six billion, six million, four hundred one thousand, seven hundred ninety-nine".