66211378 has 8 divisors (see below), whose sum is σ = 99788400. Its totient is φ = 32948580.

The previous prime is 66211361. The next prime is 66211421. The reversal of 66211378 is 87311266.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78028 + ... + 78871.

It is an arithmetic number, because the mean of its divisors is an integer number (12473550).

Almost surely, 2^66211378 is an apocalyptic number.

66211378 is a deficient number, since it is larger than the sum of its proper divisors (33577022).

66211378 is a wasteful number, since it uses less digits than its factorization.

66211378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157112.

The product of its digits is 12096, while the sum is 34.

The square root of 66211378 is about 8137.0374215681. The cubic root of 66211378 is about 404.5549712069.

The spelling of 66211378 in words is "sixty-six million, two hundred eleven thousand, three hundred seventy-eight".