68137533 has 6 divisors (see below), whose sum is σ = 98420894. Its totient is φ = 45425016.

The previous prime is 68137483. The next prime is 68137541. The reversal of 68137533 is 33573186.

It can be written as a sum of positive squares in only one way, i.e., 43007364 + 25130169 = 6558^2 + 5013^2 .

It is not a de Polignac number, because 68137533 - 2¹² = 68133437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68137583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3785410 + ... + 3785427.

Almost surely, 2^68137533 is an apocalyptic number.

It is an amenable number.

68137533 is a deficient number, since it is larger than the sum of its proper divisors (30283361).

68137533 is a wasteful number, since it uses less digits than its factorization.

68137533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7570843 (or 7570840 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 68137533 is about 8254.5462019423. The cubic root of 68137533 is about 408.4405024642.

The spelling of 68137533 in words is "sixty-eight million, one hundred thirty-seven thousand, five hundred thirty-three".