68557541 has 4 divisors (see below), whose sum is σ = 73831212. Its totient is φ = 63283872.

The previous prime is 68557507. The next prime is 68557553. The reversal of 68557541 is 14575586.

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 6604900 + 61952641 = 2570^2 + 7871^2 .

It is a cyclic number.

It is not a de Polignac number, because 68557541 - 2¹⁰ = 68556517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68557571) 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, 2636816 + ... + 2636841.

It is an arithmetic number, because the mean of its divisors is an integer number (18457803).

Almost surely, 2^68557541 is an apocalyptic number.

It is an amenable number.

68557541 is a deficient number, since it is larger than the sum of its proper divisors (5273671).

68557541 is a wasteful number, since it uses less digits than its factorization.

68557541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5273670.

The product of its digits is 168000, while the sum is 41.

The square root of 68557541 is about 8279.9481278568. The cubic root of 68557541 is about 409.2780095459.

The spelling of 68557541 in words is "sixty-eight million, five hundred fifty-seven thousand, five hundred forty-one".