68666645 has 8 divisors (see below), whose sum is σ = 82564920. Its totient is φ = 54823360.

The previous prime is 68666639. The next prime is 68666651. The reversal of 68666645 is 54666686.

It is an interprime number because it is at equal distance from previous prime (68666639) and next prime (68666651).

It can be written as a sum of positive squares in 4 ways, for example, as 4778596 + 63888049 = 2186^2 + 7993^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68666645 - 2⁴ = 68666629 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68666645.

It is a congruent 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, 10946 + ... + 16035.

It is an arithmetic number, because the mean of its divisors is an integer number (10320615).

Almost surely, 2^68666645 is an apocalyptic number.

It is an amenable number.

68666645 is a deficient number, since it is larger than the sum of its proper divisors (13898275).

68666645 is a wasteful number, since it uses less digits than its factorization.

68666645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27495.

The product of its digits is 1244160, while the sum is 47.

The square root of 68666645 is about 8286.5339557622. The cubic root of 68666645 is about 409.4950058602.

The spelling of 68666645 in words is "sixty-eight million, six hundred sixty-six thousand, six hundred forty-five".