166556160526399 has 4 divisors (see below), whose sum is σ = 190349897744464. Its totient is φ = 142762423308336.

The previous prime is 166556160526391. The next prime is 166556160526421. The reversal of 166556160526399 is 993625061655661.

166556160526399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166556160526399 - 2³ = 166556160526391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166556160526391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11896868609022 + ... + 11896868609035.

It is an arithmetic number, because the mean of its divisors is an integer number (47587474436116).

Almost surely, 2^{166556160526399} is an apocalyptic number.

166556160526399 is a deficient number, since it is larger than the sum of its proper divisors (23793737218065).

166556160526399 is an equidigital number, since it uses as much as digits as its factorization.

166556160526399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23793737218064.

The product of its (nonzero) digits is 472392000, while the sum is 70.

The spelling of 166556160526399 in words is "one hundred sixty-six trillion, five hundred fifty-six billion, one hundred sixty million, five hundred twenty-six thousand, three hundred ninety-nine".