172665832420 has 12 divisors (see below), whose sum is σ = 362598248124. Its totient is φ = 69066332960.

The previous prime is 172665832411. The next prime is 172665832481. The reversal of 172665832420 is 24238566271.

172665832420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 66379400164 + 106286432256 = 257642^2 + 326016^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4316645791 + ... + 4316645830.

It is an arithmetic number, because the mean of its divisors is an integer number (30216520677).

Almost surely, 2^172665832420 is an apocalyptic number.

172665832420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172665832420 is an abundant number, since it is smaller than the sum of its proper divisors (189932415704).

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

172665832420 is a wasteful number, since it uses less digits than its factorization.

172665832420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8633291630 (or 8633291628 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 172665832420 in words is "one hundred seventy-two billion, six hundred sixty-five million, eight hundred thirty-two thousand, four hundred twenty".