68781666 has 16 divisors (see below), whose sum is σ = 139305600. Its totient is φ = 22636848.

The previous prime is 68781623. The next prime is 68781673. The reversal of 68781666 is 66618786.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72081 + ... + 73028.

It is an arithmetic number, because the mean of its divisors is an integer number (8706600).

Almost surely, 2^68781666 is an apocalyptic number.

68781666 is an abundant number, since it is smaller than the sum of its proper divisors (70523934).

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

68781666 is a wasteful number, since it uses less digits than its factorization.

68781666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145193.

The product of its digits is 580608, while the sum is 48.

The square root of 68781666 is about 8293.4712877058. The cubic root of 68781666 is about 409.7235217125.

The spelling of 68781666 in words is "sixty-eight million, seven hundred eighty-one thousand, six hundred sixty-six".