129331669256 has 16 divisors (see below), whose sum is σ = 242543298300. Its totient is φ = 64653456384.

The previous prime is 129331669231. The next prime is 129331669283. The reversal of 129331669256 is 652966133921.

It can be written as a sum of positive squares in 2 ways, for example, as 124232281156 + 5099388100 = 352466^2 + 71410^2 .

It is a super-4 number, since 4×129331669256⁴ (a number of 46 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 129331669198 and 129331669207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502801 + ... + 1586528.

Almost surely, 2^129331669256 is an apocalyptic number.

It is an amenable number.

129331669256 is a deficient number, since it is larger than the sum of its proper divisors (113211629044).

129331669256 is a wasteful number, since it uses less digits than its factorization.

129331669256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094568 (or 3094564 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 53.

The spelling of 129331669256 in words is "one hundred twenty-nine billion, three hundred thirty-one million, six hundred sixty-nine thousand, two hundred fifty-six".