68517561 has 8 divisors (see below), whose sum is σ = 104407744. Its totient is φ = 39152880.

The previous prime is 68517521. The next prime is 68517563. The reversal of 68517561 is 16571586.

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

It is not a de Polignac number, because 68517561 - 2⁷ = 68517433 is a prime.

It is a super-3 number, since 3×68517561³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68517563) 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, 1631350 + ... + 1631391.

It is an arithmetic number, because the mean of its divisors is an integer number (13050968).

Almost surely, 2^68517561 is an apocalyptic number.

It is an amenable number.

68517561 is a deficient number, since it is larger than the sum of its proper divisors (35890183).

68517561 is a wasteful number, since it uses less digits than its factorization.

68517561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262751.

The product of its digits is 50400, while the sum is 39.

The square root of 68517561 is about 8277.5335094459. The cubic root of 68517561 is about 409.1984359189.

The spelling of 68517561 in words is "sixty-eight million, five hundred seventeen thousand, five hundred sixty-one".