68142565 has 4 divisors (see below), whose sum is σ = 81771084. Its totient is φ = 54514048.

The previous prime is 68142563. The next prime is 68142587. The reversal of 68142565 is 56524186.

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 28376929 + 39765636 = 5327^2 + 6306^2 .

It is a cyclic number.

It is not a de Polignac number, because 68142565 - 2¹ = 68142563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68142563) 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, 6814252 + ... + 6814261.

It is an arithmetic number, because the mean of its divisors is an integer number (20442771).

Almost surely, 2^68142565 is an apocalyptic number.

It is an amenable number.

68142565 is a deficient number, since it is larger than the sum of its proper divisors (13628519).

68142565 is a wasteful number, since it uses less digits than its factorization.

68142565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13628518.

The product of its digits is 57600, while the sum is 37.

The square root of 68142565 is about 8254.8509980496. The cubic root of 68142565 is about 408.4505567467.

The spelling of 68142565 in words is "sixty-eight million, one hundred forty-two thousand, five hundred sixty-five".