68777661 has 8 divisors (see below), whose sum is σ = 91749024. Its totient is φ = 45829040.

The previous prime is 68777641. The next prime is 68777693. The reversal of 68777661 is 16677786.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 68777661 - 2¹¹ = 68775613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68777661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68777641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3490 + ... + 12236.

It is an arithmetic number, because the mean of its divisors is an integer number (11468628).

Almost surely, 2^68777661 is an apocalyptic number.

It is an amenable number.

68777661 is a deficient number, since it is larger than the sum of its proper divisors (22971363).

68777661 is a wasteful number, since it uses less digits than its factorization.

68777661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11371.

The product of its digits is 592704, while the sum is 48.

The square root of 68777661 is about 8293.2298292041. The cubic root of 68777661 is about 409.7155691352.

The spelling of 68777661 in words is "sixty-eight million, seven hundred seventy-seven thousand, six hundred sixty-one".