68145655 has 4 divisors (see below), whose sum is σ = 81774792. Its totient is φ = 54516520.

The previous prime is 68145653. The next prime is 68145659. The reversal of 68145655 is 55654186.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 68145655 - 2¹ = 68145653 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 (68145653) 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, 6814561 + ... + 6814570.

It is an arithmetic number, because the mean of its divisors is an integer number (20443698).

Almost surely, 2^68145655 is an apocalyptic number.

68145655 is a deficient number, since it is larger than the sum of its proper divisors (13629137).

68145655 is a wasteful number, since it uses less digits than its factorization.

68145655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13629136.

The product of its digits is 144000, while the sum is 40.

The square root of 68145655 is about 8255.0381586035. The cubic root of 68145655 is about 408.4567305342.

The spelling of 68145655 in words is "sixty-eight million, one hundred forty-five thousand, six hundred fifty-five".