68656771 has 4 divisors (see below), whose sum is σ = 71641872. Its totient is φ = 65671672.

The previous prime is 68656769. The next prime is 68656799. The reversal of 68656771 is 17765686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17765686 = 2 ⋅8882843.

It is a cyclic number.

It is not a de Polignac number, because 68656771 - 2¹ = 68656769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68651771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492516 + ... + 1492561.

It is an arithmetic number, because the mean of its divisors is an integer number (17910468).

Almost surely, 2^68656771 is an apocalyptic number.

68656771 is a deficient number, since it is larger than the sum of its proper divisors (2985101).

68656771 is a wasteful number, since it uses less digits than its factorization.

68656771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985100.

The product of its digits is 423360, while the sum is 46.

The square root of 68656771 is about 8285.9381484537. The cubic root of 68656771 is about 409.4753769826.

The spelling of 68656771 in words is "sixty-eight million, six hundred fifty-six thousand, seven hundred seventy-one".