165571206672 has 20 divisors (see below), whose sum is σ = 427725617360. Its totient is φ = 55190402208.

The previous prime is 165571206667. The next prime is 165571206679. The reversal of 165571206672 is 276602175561.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 3449400139 = 165571206672 / (1 + 6 + 5 + 5 + 7 + 1 + 2 + 0 + 6 + 6 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (165571206679) 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, 1724700022 + ... + 1724700117.

It is an arithmetic number, because the mean of its divisors is an integer number (21386280868).

Almost surely, 2^165571206672 is an apocalyptic number.

165571206672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165571206672 is an abundant number, since it is smaller than the sum of its proper divisors (262154410688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165571206672 is a wasteful number, since it uses less digits than its factorization.

165571206672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449400150 (or 3449400144 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 165571206672 in words is "one hundred sixty-five billion, five hundred seventy-one million, two hundred six thousand, six hundred seventy-two".