66707813 has 8 divisors (see below), whose sum is σ = 71687232. Its totient is φ = 61845696.

The previous prime is 66707791. The next prime is 66707827. The reversal of 66707813 is 31870766.

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

It is a cyclic number.

It is not a de Polignac number, because 66707813 - 2¹⁰ = 66706789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707873) 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, 28145 + ... + 30422.

It is an arithmetic number, because the mean of its divisors is an integer number (8960904).

Almost surely, 2^66707813 is an apocalyptic number.

It is an amenable number.

66707813 is a deficient number, since it is larger than the sum of its proper divisors (4979419).

66707813 is a wasteful number, since it uses less digits than its factorization.

66707813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58651.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66707813 is about 8167.4851086488. The cubic root of 66707813 is about 405.5635359855.

The spelling of 66707813 in words is "sixty-six million, seven hundred seven thousand, eight hundred thirteen".