68956561 has 4 divisors (see below), whose sum is σ = 69589300. Its totient is φ = 68323824.

The previous prime is 68956523. The next prime is 68956579. The reversal of 68956561 is 16565986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52707600 + 16248961 = 7260^2 + 4031^2 .

It is a cyclic number.

It is not a de Polignac number, because 68956561 - 2¹⁷ = 68825489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68656561) 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, 316206 + ... + 316423.

It is an arithmetic number, because the mean of its divisors is an integer number (17397325).

Almost surely, 2^68956561 is an apocalyptic number.

It is an amenable number.

68956561 is a deficient number, since it is larger than the sum of its proper divisors (632739).

68956561 is a wasteful number, since it uses less digits than its factorization.

68956561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632738.

The product of its digits is 388800, while the sum is 46.

The square root of 68956561 is about 8304.0087307276. The cubic root of 68956561 is about 410.0705034417.

It can be divided in two parts, 6895 and 6561, that added together give a square (13456 = 116²).

The spelling of 68956561 in words is "sixty-eight million, nine hundred fifty-six thousand, five hundred sixty-one".