66805136 has 10 divisors (see below), whose sum is σ = 129434982. Its totient is φ = 33402560.

The previous prime is 66805111. The next prime is 66805157. The reversal of 66805136 is 63150866.

It can be written as a sum of positive squares in only one way, i.e., 39137536 + 27667600 = 6256^2 + 5260^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66805096 and 66805105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2087645 + ... + 2087676.

Almost surely, 2^66805136 is an apocalyptic number.

It is an amenable number.

66805136 is a deficient number, since it is larger than the sum of its proper divisors (62629846).

66805136 is a wasteful number, since it uses less digits than its factorization.

66805136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175329 (or 4175323 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 66805136 is about 8173.4408910813. The cubic root of 66805136 is about 405.7606717163.

The spelling of 66805136 in words is "sixty-six million, eight hundred five thousand, one hundred thirty-six".