172920410569 has 27 divisors (see below), whose sum is σ = 187218101343. Its totient is φ = 159681408000.

The previous prime is 172920410563. The next prime is 172920410581. The reversal of 172920410569 is 965014029271.

The square root of 172920410569 is 415837.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 27292692025 + 145627718544 = 165205^2 + 381612^2 .

It is not a de Polignac number, because 172920410569 - 2¹⁵ = 172920377801 is a prime.

It is a super-2 number, since 2×172920410569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172920410563) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 431222769 + ... + 431223169.

Almost surely, 2^172920410569 is an apocalyptic number.

172920410569 is the 415837-th square number.

172920410569 is the 207919-th centered octagonal number.

It is an amenable number.

172920410569 is a deficient number, since it is larger than the sum of its proper divisors (14297690774).

172920410569 is an frugal number, since it uses more digits than its factorization.

172920410569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 172920410569 in words is "one hundred seventy-two billion, nine hundred twenty million, four hundred ten thousand, five hundred sixty-nine".