66225278 has 16 divisors (see below), whose sum is σ = 114284544. Its totient is φ = 28193400.

The previous prime is 66225277. The next prime is 66225281. The reversal of 66225278 is 87252266.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66225277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13550 + ... + 17777.

It is an arithmetic number, because the mean of its divisors is an integer number (7142784).

Almost surely, 2^66225278 is an apocalyptic number.

66225278 is a deficient number, since it is larger than the sum of its proper divisors (48059266).

66225278 is a wasteful number, since it uses less digits than its factorization.

66225278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31487.

The product of its digits is 80640, while the sum is 38.

The square root of 66225278 is about 8137.8914959589. The cubic root of 66225278 is about 404.5832791342.

The spelling of 66225278 in words is "sixty-six million, two hundred twenty-five thousand, two hundred seventy-eight".