50129866609 has 9 divisors (see below), whose sum is σ = 50449140801. Its totient is φ = 49812604560.

The previous prime is 50129866603. The next prime is 50129866643. The reversal of 50129866609 is 90666892105.

The square root of 50129866609 is 223897.

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

It can be written as a sum of positive squares in 4 ways, for example, as 8052370225 + 42077496384 = 89735^2 + 205128^2 .

It is not a de Polignac number, because 50129866609 - 2¹⁵ = 50129833841 is a prime.

It is a super-2 number, since 2×50129866609² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50129866603) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 40524739 + ... + 40525975.

It is an arithmetic number, because the mean of its divisors is an integer number (5605460089).

Almost surely, 2^50129866609 is an apocalyptic number.

50129866609 is the 223897-th square number.

50129866609 is the 111949-th centered octagonal number.

It is an amenable number.

50129866609 is a deficient number, since it is larger than the sum of its proper divisors (319274192).

50129866609 is an frugal number, since it uses more digits than its factorization.

50129866609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836 (or 1418 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 50129866609 in words is "fifty billion, one hundred twenty-nine million, eight hundred sixty-six thousand, six hundred nine".