129444479266 has 4 divisors (see below), whose sum is σ = 194166718902. Its totient is φ = 64722239632.

The previous prime is 129444479249. The next prime is 129444479357. The reversal of 129444479266 is 662974444921.

It is a happy number.

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., 120481881025 + 8962598241 = 347105^2 + 94671^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129444479266.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32361119815 + ... + 32361119818.

Almost surely, 2^129444479266 is an apocalyptic number.

129444479266 is a deficient number, since it is larger than the sum of its proper divisors (64722239636).

129444479266 is an equidigital number, since it uses as much as digits as its factorization.

129444479266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64722239635.

The product of its digits is 20901888, while the sum is 58.

The spelling of 129444479266 in words is "one hundred twenty-nine billion, four hundred forty-four million, four hundred seventy-nine thousand, two hundred sixty-six".