166061160056561 has 32 divisors (see below), whose sum is σ = 208620969984000. Its totient is φ = 128411902428480.

The previous prime is 166061160056557. The next prime is 166061160056567. The reversal of 166061160056561 is 165650061160661.

It is not a de Polignac number, because 166061160056561 - 2² = 166061160056557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166061160056567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8279306 + ... + 20016723.

It is an arithmetic number, because the mean of its divisors is an integer number (6519405312000).

Almost surely, 2^{166061160056561} is an apocalyptic number.

166061160056561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166061160056561 is a deficient number, since it is larger than the sum of its proper divisors (42559809927439).

166061160056561 is a wasteful number, since it uses less digits than its factorization.

166061160056561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28296629.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 166061160056561 in words is "one hundred sixty-six trillion, sixty-one billion, one hundred sixty million, fifty-six thousand, five hundred sixty-one".