66695838 has 64 divisors (see below), whose sum is σ = 151455744. Its totient is φ = 19404000.

The previous prime is 66695821. The next prime is 66695843. The reversal of 66695838 is 83859666.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 201333 + ... + 201663.

It is an arithmetic number, because the mean of its divisors is an integer number (2366496).

Almost surely, 2^66695838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66695838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75727872).

66695838 is an abundant number, since it is smaller than the sum of its proper divisors (84759906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66695838 is a wasteful number, since it uses less digits than its factorization.

66695838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461.

The product of its digits is 1866240, while the sum is 51.

The square root of 66695838 is about 8166.7519859489. The cubic root of 66695838 is about 405.5392663947.

The spelling of 66695838 in words is "sixty-six million, six hundred ninety-five thousand, eight hundred thirty-eight".