68645533 has 4 divisors (see below), whose sum is σ = 74886048. Its totient is φ = 62405020.

The previous prime is 68645531. The next prime is 68645561. The reversal of 68645533 is 33554686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68645533 - 2¹ = 68645531 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 (68645531) 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, 3120241 + ... + 3120262.

It is an arithmetic number, because the mean of its divisors is an integer number (18721512).

Almost surely, 2^68645533 is an apocalyptic number.

It is an amenable number.

68645533 is a deficient number, since it is larger than the sum of its proper divisors (6240515).

68645533 is a wasteful number, since it uses less digits than its factorization.

68645533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240514.

The product of its digits is 259200, while the sum is 40.

The square root of 68645533 is about 8285.2599838508. The cubic root of 68645533 is about 409.4530342706.

The spelling of 68645533 in words is "sixty-eight million, six hundred forty-five thousand, five hundred thirty-three".