120666651666571 has 16 divisors (see below), whose sum is σ = 121171881600000. Its totient is φ = 120162798677376.

The previous prime is 120666651666563. The next prime is 120666651666611. The reversal of 120666651666571 is 175666156666021.

It is a cyclic number.

It is not a de Polignac number, because 120666651666571 - 2³ = 120666651666563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120666651666371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 398142190 + ... + 398445148.

It is an arithmetic number, because the mean of its divisors is an integer number (7573242600000).

Almost surely, 2^{120666651666571} is an apocalyptic number.

120666651666571 is a deficient number, since it is larger than the sum of its proper divisors (505229933429).

120666651666571 is a wasteful number, since it uses less digits than its factorization.

120666651666571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305226.

The product of its (nonzero) digits is 97977600, while the sum is 64.

The spelling of 120666651666571 in words is "one hundred twenty trillion, six hundred sixty-six billion, six hundred fifty-one million, six hundred sixty-six thousand, five hundred seventy-one".