66565013 has 8 divisors (see below), whose sum is σ = 73545408. Its totient is φ = 59925184.

The previous prime is 66565007. The next prime is 66565043. The reversal of 66565013 is 31056566.

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 66565013 - 2⁴ = 66564997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565003) 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, 84731 + ... + 85512.

It is an arithmetic number, because the mean of its divisors is an integer number (9193176).

Almost surely, 2^66565013 is an apocalyptic number.

It is an amenable number.

66565013 is a deficient number, since it is larger than the sum of its proper divisors (6980395).

66565013 is a wasteful number, since it uses less digits than its factorization.

66565013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170283.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 66565013 is about 8158.7384441469. The cubic root of 66565013 is about 405.2739354876.

The spelling of 66565013 in words is "sixty-six million, five hundred sixty-five thousand, thirteen".