66397513 has 8 divisors (see below), whose sum is σ = 81720128. Its totient is φ = 52534224.

The previous prime is 66397453. The next prime is 66397531. The reversal of 66397513 is 31579366.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66397513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66397213) 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, 364731 + ... + 364912.

It is an arithmetic number, because the mean of its divisors is an integer number (10215016).

Almost surely, 2^66397513 is an apocalyptic number.

It is an amenable number.

66397513 is a deficient number, since it is larger than the sum of its proper divisors (15322615).

66397513 is a wasteful number, since it uses less digits than its factorization.

66397513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729663.

The product of its digits is 102060, while the sum is 40.

The square root of 66397513 is about 8148.4669110207. The cubic root of 66397513 is about 404.9337147018.

The spelling of 66397513 in words is "sixty-six million, three hundred ninety-seven thousand, five hundred thirteen".