68155253 has 4 divisors (see below), whose sum is σ = 68549388. Its totient is φ = 67761120.

The previous prime is 68155237. The next prime is 68155271. The reversal of 68155253 is 35255186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35255186 = 2 ⋅17627593.

It can be written as a sum of positive squares in 2 ways, for example, as 37662769 + 30492484 = 6137^2 + 5522^2 .

It is a cyclic number.

It is not a de Polignac number, because 68155253 - 2⁴ = 68155237 is a prime.

It is a super-2 number, since 2×68155253² = 9290277022988018, which contains 22 as substring.

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 (68155273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196808 + ... + 197153.

It is an arithmetic number, because the mean of its divisors is an integer number (17137347).

Almost surely, 2^68155253 is an apocalyptic number.

It is an amenable number.

68155253 is a deficient number, since it is larger than the sum of its proper divisors (394135).

68155253 is a wasteful number, since it uses less digits than its factorization.

68155253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394134.

The product of its digits is 36000, while the sum is 35.

The square root of 68155253 is about 8255.6194800875. The cubic root of 68155253 is about 408.4759060471.

The spelling of 68155253 in words is "sixty-eight million, one hundred fifty-five thousand, two hundred fifty-three".