166872471847 has 4 divisors (see below), whose sum is σ = 168882983640. Its totient is φ = 164861960056.

The previous prime is 166872471841. The next prime is 166872471911. The reversal of 166872471847 is 748174278661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748174278661 = 1997 ⋅374649113.

It is a cyclic number.

It is not a de Polignac number, because 166872471847 - 2³ = 166872471839 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 (166872471841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005255772 + ... + 1005255937.

It is an arithmetic number, because the mean of its divisors is an integer number (42220745910).

Almost surely, 2^166872471847 is an apocalyptic number.

166872471847 is a deficient number, since it is larger than the sum of its proper divisors (2010511793).

166872471847 is an equidigital number, since it uses as much as digits as its factorization.

166872471847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010511792.

The product of its digits is 25288704, while the sum is 61.

The spelling of 166872471847 in words is "one hundred sixty-six billion, eight hundred seventy-two million, four hundred seventy-one thousand, eight hundred forty-seven".