66613493 has 8 divisors (see below), whose sum is σ = 70514400. Its totient is φ = 62819568.

The previous prime is 66613471. The next prime is 66613517. The reversal of 66613493 is 39431666.

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

It is not a de Polignac number, because 66613493 - 2¹² = 66609397 is a prime.

It is a super-2 number, since 2×66613493² = 8874714899322098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66613423) 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, 25463 + ... + 27956.

It is an arithmetic number, because the mean of its divisors is an integer number (8814300).

Almost surely, 2^66613493 is an apocalyptic number.

It is an amenable number.

66613493 is a deficient number, since it is larger than the sum of its proper divisors (3900907).

66613493 is a wasteful number, since it uses less digits than its factorization.

66613493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53491.

The product of its digits is 69984, while the sum is 38.

The square root of 66613493 is about 8161.7089509489. The cubic root of 66613493 is about 405.3723000366.

The spelling of 66613493 in words is "sixty-six million, six hundred thirteen thousand, four hundred ninety-three".