129356610666 has 32 divisors (see below), whose sum is σ = 260292529728. Its totient is φ = 42856450560.

The previous prime is 129356610659. The next prime is 129356610689. The reversal of 129356610666 is 666016653921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550756 + ... + 749696.

It is an arithmetic number, because the mean of its divisors is an integer number (8134141554).

Almost surely, 2^129356610666 is an apocalyptic number.

129356610666 is an abundant number, since it is smaller than the sum of its proper divisors (130935919062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129356610666 is a wasteful number, since it uses less digits than its factorization.

129356610666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199606.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The spelling of 129356610666 in words is "one hundred twenty-nine billion, three hundred fifty-six million, six hundred ten thousand, six hundred sixty-six".