66925538 has 32 divisors (see below), whose sum is σ = 108210816. Its totient is φ = 30970368.

The previous prime is 66925531. The next prime is 66925541. The reversal of 66925538 is 83552966.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66925531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236345 + ... + 236627.

It is an arithmetic number, because the mean of its divisors is an integer number (3381588).

Almost surely, 2^66925538 is an apocalyptic number.

66925538 is a deficient number, since it is larger than the sum of its proper divisors (41285278).

66925538 is a wasteful number, since it uses less digits than its factorization.

66925538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458.

The product of its digits is 388800, while the sum is 44.

The square root of 66925538 is about 8180.8030168193. The cubic root of 66925538 is about 406.0042910885.

The spelling of 66925538 in words is "sixty-six million, nine hundred twenty-five thousand, five hundred thirty-eight".