68666693 has 4 divisors (see below), whose sum is σ = 71034540. Its totient is φ = 66298848.

The previous prime is 68666687. The next prime is 68666699. The reversal of 68666693 is 39666686.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (68666687) and next prime (68666699).

It can be written as a sum of positive squares in 2 ways, for example, as 19918369 + 48748324 = 4463^2 + 6982^2 .

It is a cyclic number.

It is not a de Polignac number, because 68666693 - 2⁶ = 68666629 is a prime.

It is a super-2 number, since 2×68666693² = 9430229455112498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68666699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1183880 + ... + 1183937.

It is an arithmetic number, because the mean of its divisors is an integer number (17758635).

Almost surely, 2^68666693 is an apocalyptic number.

It is an amenable number.

68666693 is a deficient number, since it is larger than the sum of its proper divisors (2367847).

68666693 is a wasteful number, since it uses less digits than its factorization.

68666693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367846.

The product of its digits is 1679616, while the sum is 50.

The square root of 68666693 is about 8286.5368520269. The cubic root of 68666693 is about 409.4951012765.

The spelling of 68666693 in words is "sixty-eight million, six hundred sixty-six thousand, six hundred ninety-three".