66813436 has 24 divisors (see below), whose sum is σ = 124989984. Its totient is φ = 31173120.

The previous prime is 66813433. The next prime is 66813437. The reversal of 66813436 is 63431866.

It is a junction number, because it is equal to n+sod(n) for n = 66813395 and 66813404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66813431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5085 + ... + 12628.

It is an arithmetic number, because the mean of its divisors is an integer number (5207916).

Almost surely, 2^66813436 is an apocalyptic number.

It is an amenable number.

66813436 is a deficient number, since it is larger than the sum of its proper divisors (58176548).

66813436 is a wasteful number, since it uses less digits than its factorization.

66813436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17781 (or 17779 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The square root of 66813436 is about 8173.9486174064. The cubic root of 66813436 is about 405.7774751853. Note that the first 3 decimals are identical.

The spelling of 66813436 in words is "sixty-six million, eight hundred thirteen thousand, four hundred thirty-six".