68552221 has 4 divisors (see below), whose sum is σ = 68619744. Its totient is φ = 68484700.

The previous prime is 68552219. The next prime is 68552251. The reversal of 68552221 is 12225586.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12225586 = 2 ⋅6112793.

It is a cyclic number.

It is not a de Polignac number, because 68552221 - 2¹ = 68552219 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68552251) 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, 32215 + ... + 34276.

It is an arithmetic number, because the mean of its divisors is an integer number (17154936).

Almost surely, 2^68552221 is an apocalyptic number.

It is an amenable number.

68552221 is a deficient number, since it is larger than the sum of its proper divisors (67523).

68552221 is a wasteful number, since it uses less digits than its factorization.

68552221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67522.

The product of its digits is 9600, while the sum is 31.

The square root of 68552221 is about 8279.6268635730. The cubic root of 68552221 is about 409.2674227439.

The spelling of 68552221 in words is "sixty-eight million, five hundred fifty-two thousand, two hundred twenty-one".