68606591 has 4 divisors (see below), whose sum is σ = 68644800. Its totient is φ = 68568384.

The previous prime is 68606579. The next prime is 68606597. The reversal of 68606591 is 19560686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19560686 = 2 ⋅9780343.

It is a cyclic number.

It is not a de Polignac number, because 68606591 - 2¹⁰ = 68605567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68606597) 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, 16271 + ... + 20048.

It is an arithmetic number, because the mean of its divisors is an integer number (17161200).

Almost surely, 2^68606591 is an apocalyptic number.

68606591 is a deficient number, since it is larger than the sum of its proper divisors (38209).

68606591 is a wasteful number, since it uses less digits than its factorization.

68606591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38208.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 68606591 is about 8282.9095733323. The cubic root of 68606591 is about 409.3755932707.

The spelling of 68606591 in words is "sixty-eight million, six hundred six thousand, five hundred ninety-one".