66219393 has 8 divisors (see below), whose sum is σ = 88781056. Its totient is φ = 43902000.

The previous prime is 66219371. The next prime is 66219407. The reversal of 66219393 is 39391266.

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

It is not a de Polignac number, because 66219393 - 2⁹ = 66218881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66219493) 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, 60433 + ... + 61518.

It is an arithmetic number, because the mean of its divisors is an integer number (11097632).

Almost surely, 2^66219393 is an apocalyptic number.

It is an amenable number.

66219393 is a deficient number, since it is larger than the sum of its proper divisors (22561663).

66219393 is a wasteful number, since it uses less digits than its factorization.

66219393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122135.

The product of its digits is 52488, while the sum is 39.

The square root of 66219393 is about 8137.5299077791. The cubic root of 66219393 is about 404.5712945709.

The spelling of 66219393 in words is "sixty-six million, two hundred nineteen thousand, three hundred ninety-three".