66357493 has 4 divisors (see below), whose sum is σ = 66374208.
Its totient is φ = 66340780.
The previous prime is 66357491. The next prime is 66357497. The reversal of 66357493 is 39475366.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 66357493 - 21 = 66357491 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 (66357491) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1380 + ... + 11602.
It is an arithmetic number, because the mean of its divisors is an integer number (16593552).
Almost surely, 266357493 is an apocalyptic number.
It is an amenable number.
66357493 is a deficient number, since it is larger than the sum of its proper divisors (16715).
66357493 is a wasteful number, since it uses less digits than its factorization.
66357493 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 16714.
The product of its digits is 408240, while the sum is 43.
The square root of 66357493 is about 8146.0108642206.
The cubic root of 66357493 is about 404.8523426570.
The spelling of 66357493 in words is "sixty-six million, three hundred fifty-seven thousand, four hundred ninety-three".