129120280258 has 4 divisors (see below), whose sum is σ = 193680420390. Its totient is φ = 64560140128.

The previous prime is 129120280213. The next prime is 129120280271. The reversal of 129120280258 is 852082021921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 127901362689 + 1218917569 = 357633^2 + 34913^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 129120280258.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32280070063 + ... + 32280070066.

Almost surely, 2^129120280258 is an apocalyptic number.

129120280258 is a deficient number, since it is larger than the sum of its proper divisors (64560140132).

129120280258 is an equidigital number, since it uses as much as digits as its factorization.

129120280258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64560140131.

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 129120280258 in words is "one hundred twenty-nine billion, one hundred twenty million, two hundred eighty thousand, two hundred fifty-eight".