668632875662166 has 32 divisors (see below), whose sum is σ = 1356208831726848. Its totient is φ = 219720946781280.

The previous prime is 668632875662119. The next prime is 668632875662221. The reversal of 668632875662166 is 661266578236866.

It is a junction number, because it is equal to n+sod(n) for n = 668632875662091 and 668632875662100.

It is a congruent 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, 57364920 + ... + 68029403.

It is an arithmetic number, because the mean of its divisors is an integer number (42381525991464).

Almost surely, 2^{668632875662166} is an apocalyptic number.

668632875662166 is an abundant number, since it is smaller than the sum of its proper divisors (687575956064682).

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

668632875662166 is a wasteful number, since it uses less digits than its factorization.

668632875662166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125406916.

The product of its digits is 7524679680, while the sum is 78.

The spelling of 668632875662166 in words is "six hundred sixty-eight trillion, six hundred thirty-two billion, eight hundred seventy-five million, six hundred sixty-two thousand, one hundred sixty-six".