68417561 has 4 divisors (see below), whose sum is σ = 70086324. Its totient is φ = 66748800.

The previous prime is 68417533. The next prime is 68417563. The reversal of 68417561 is 16571486.

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 10368400 + 58049161 = 3220^2 + 7619^2 .

It is a cyclic number.

It is not a de Polignac number, because 68417561 - 2⁶ = 68417497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68417563) 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, 834320 + ... + 834401.

It is an arithmetic number, because the mean of its divisors is an integer number (17521581).

Almost surely, 2^68417561 is an apocalyptic number.

It is an amenable number.

68417561 is a deficient number, since it is larger than the sum of its proper divisors (1668763).

68417561 is a wasteful number, since it uses less digits than its factorization.

68417561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668762.

The product of its digits is 40320, while the sum is 38.

The square root of 68417561 is about 8271.4908571551. The cubic root of 68417561 is about 408.9992667016. Note that the first 3 decimals are identical.

The spelling of 68417561 in words is "sixty-eight million, four hundred seventeen thousand, five hundred sixty-one".