166556144166413 has 4 divisors (see below), whose sum is σ = 166559260156188. Its totient is φ = 166553028176640.

The previous prime is 166556144166403. The next prime is 166556144166439. The reversal of 166556144166413 is 314661441655661.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 124669127174089 + 41887016992324 = 11165533^2 + 6472018^2 .

It is a cyclic number.

It is not a de Polignac number, because 166556144166413 - 2⁴⁶ = 96187399988749 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 (166556144166403) 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, 1557914708 + ... + 1558021613.

It is an arithmetic number, because the mean of its divisors is an integer number (41639815039047).

Almost surely, 2^{166556144166413} is an apocalyptic number.

It is an amenable number.

166556144166413 is a deficient number, since it is larger than the sum of its proper divisors (3115989775).

166556144166413 is an equidigital number, since it uses as much as digits as its factorization.

166556144166413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115989774.

The product of its digits is 37324800, while the sum is 59.

The spelling of 166556144166413 in words is "one hundred sixty-six trillion, five hundred fifty-six billion, one hundred forty-four million, one hundred sixty-six thousand, four hundred thirteen".