66775838 has 8 divisors (see below), whose sum is σ = 100952832. Its totient is φ = 33124896.

The previous prime is 66775837. The next prime is 66775853. The reversal of 66775838 is 83857766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66775837) 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, 131195 + ... + 131702.

It is an arithmetic number, because the mean of its divisors is an integer number (12619104).

Almost surely, 2^66775838 is an apocalyptic number.

66775838 is a deficient number, since it is larger than the sum of its proper divisors (34176994).

66775838 is a wasteful number, since it uses less digits than its factorization.

66775838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263026.

The product of its digits is 1693440, while the sum is 50.

The square root of 66775838 is about 8171.6484261133. The cubic root of 66775838 is about 405.7013463652.

The spelling of 66775838 in words is "sixty-six million, seven hundred seventy-five thousand, eight hundred thirty-eight".