66813034 has 4 divisors (see below), whose sum is σ = 100219554. Its totient is φ = 33406516.

The previous prime is 66812981. The next prime is 66813037. The reversal of 66813034 is 43031866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 60295225 + 6517809 = 7765^2 + 2553^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 66812987 and 66813005.

It is not an unprimeable number, because it can be changed into a prime (66813037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16703257 + ... + 16703260.

Almost surely, 2^66813034 is an apocalyptic number.

66813034 is a deficient number, since it is larger than the sum of its proper divisors (33406520).

66813034 is a wasteful number, since it uses less digits than its factorization.

66813034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33406519.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 66813034 is about 8173.9240270509. The cubic root of 66813034 is about 405.7766613626.

The spelling of 66813034 in words is "sixty-six million, eight hundred thirteen thousand, thirty-four".