68644153 has 4 divisors (see below), whose sum is σ = 68689908. Its totient is φ = 68598400.

The previous prime is 68644141. The next prime is 68644171. The reversal of 68644153 is 35144686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35144686 = 2 ⋅17572343.

It can be written as a sum of positive squares in 2 ways, for example, as 8922169 + 59721984 = 2987^2 + 7728^2 .

It is a cyclic number.

It is not a de Polignac number, because 68644153 - 2²¹ = 66547001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68644133) 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, 20548 + ... + 23653.

It is an arithmetic number, because the mean of its divisors is an integer number (17172477).

Almost surely, 2^68644153 is an apocalyptic number.

It is an amenable number.

68644153 is a deficient number, since it is larger than the sum of its proper divisors (45755).

68644153 is a wasteful number, since it uses less digits than its factorization.

68644153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45754.

The product of its digits is 69120, while the sum is 37.

The square root of 68644153 is about 8285.1767030040. The cubic root of 68644153 is about 409.4502904700.

The spelling of 68644153 in words is "sixty-eight million, six hundred forty-four thousand, one hundred fifty-three".