66427155 has 16 divisors (see below), whose sum is σ = 118092960. Its totient is φ = 35427744.

The previous prime is 66427147. The next prime is 66427157. The reversal of 66427155 is 55172466.

It is a happy number.

66427155 is a `hidden beast` number, since 6 + 642 + 7 + 1 + 5 + 5 = 666.

It is not a de Polignac number, because 66427155 - 2³ = 66427147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66427157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245892 + ... + 246161.

It is an arithmetic number, because the mean of its divisors is an integer number (7380810).

Almost surely, 2^66427155 is an apocalyptic number.

66427155 is a deficient number, since it is larger than the sum of its proper divisors (51665805).

66427155 is a wasteful number, since it uses less digits than its factorization.

66427155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492067 (or 492061 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 66427155 is about 8150.2855778187. The cubic root of 66427155 is about 404.9939642448.

The spelling of 66427155 in words is "sixty-six million, four hundred twenty-seven thousand, one hundred fifty-five".