166017800356897 has 4 divisors (see below), whose sum is σ = 167036314469680. Its totient is φ = 164999286244116.

The previous prime is 166017800356883. The next prime is 166017800356901. The reversal of 166017800356897 is 798653008710661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166017800356897 is a prime.

It is a super-3 number, since 3×166017800356897³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166087800356897) 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 3 ways as a sum of consecutive naturals, for example, 509257056147 + ... + 509257056472.

It is an arithmetic number, because the mean of its divisors is an integer number (41759078617420).

Almost surely, 2^{166017800356897} is an apocalyptic number.

It is an amenable number.

166017800356897 is a deficient number, since it is larger than the sum of its proper divisors (1018514112783).

166017800356897 is a wasteful number, since it uses less digits than its factorization.

166017800356897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018514112782.

The product of its (nonzero) digits is 91445760, while the sum is 67.

The spelling of 166017800356897 in words is "one hundred sixty-six trillion, seventeen billion, eight hundred million, three hundred fifty-six thousand, eight hundred ninety-seven".