68445155 has 4 divisors (see below), whose sum is σ = 82134192. Its totient is φ = 54756120.

The previous prime is 68445151. The next prime is 68445187. The reversal of 68445155 is 55154486.

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: 55154486 = 2 ⋅27577243.

It is not a de Polignac number, because 68445155 - 2² = 68445151 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (68445151) 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, 6844511 + ... + 6844520.

It is an arithmetic number, because the mean of its divisors is an integer number (20533548).

Almost surely, 2^68445155 is an apocalyptic number.

68445155 is a deficient number, since it is larger than the sum of its proper divisors (13689037).

68445155 is a wasteful number, since it uses less digits than its factorization.

68445155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13689036.

The product of its digits is 96000, while the sum is 38.

The square root of 68445155 is about 8273.1587075312. The cubic root of 68445155 is about 409.0542448323.

The spelling of 68445155 in words is "sixty-eight million, four hundred forty-five thousand, one hundred fifty-five".