165725406432220 has 24 divisors (see below), whose sum is σ = 348042416735664. Its totient is φ = 66286531481856.

The previous prime is 165725406432217. The next prime is 165725406432259. The reversal of 165725406432220 is 22234604527561.

It is a super-3 number, since 3×165725406432220³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226568922 + ... + 227299201.

It is an arithmetic number, because the mean of its divisors is an integer number (14501767363986).

Almost surely, 2^{165725406432220} is an apocalyptic number.

165725406432220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165725406432220 is an abundant number, since it is smaller than the sum of its proper divisors (182317010303444).

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

165725406432220 is a wasteful number, since it uses less digits than its factorization.

165725406432220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453886389 (or 453886387 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 49.

The spelling of 165725406432220 in words is "one hundred sixty-five trillion, seven hundred twenty-five billion, four hundred six million, four hundred thirty-two thousand, two hundred twenty".