122166660561 has 16 divisors (see below), whose sum is σ = 180199738368. Its totient is φ = 72997576400.

The previous prime is 122166660521. The next prime is 122166660593. The reversal of 122166660561 is 165066661221.

It is a cyclic number.

It is not a de Polignac number, because 122166660561 - 2⁷ = 122166660433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (122166660521) 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, 26068221 + ... + 26072906.

It is an arithmetic number, because the mean of its divisors is an integer number (11262483648).

Almost surely, 2^122166660561 is an apocalyptic number.

122166660561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122166660561 is a deficient number, since it is larger than the sum of its proper divisors (58033077807).

122166660561 is a wasteful number, since it uses less digits than its factorization.

122166660561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52141212.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 122166660561 in words is "one hundred twenty-two billion, one hundred sixty-six million, six hundred sixty thousand, five hundred sixty-one".