66406274 has 8 divisors (see below), whose sum is σ = 108664848. Its totient is φ = 30184660.

The previous prime is 66406271. The next prime is 66406279. The reversal of 66406274 is 47260466.

It is a happy number.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66406271) 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, 1509212 + ... + 1509255.

It is an arithmetic number, because the mean of its divisors is an integer number (13583106).

Almost surely, 2^66406274 is an apocalyptic number.

66406274 is a deficient number, since it is larger than the sum of its proper divisors (42258574).

66406274 is a wasteful number, since it uses less digits than its factorization.

66406274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018480.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 66406274 is about 8149.0044790760. The cubic root of 66406274 is about 404.9515239444.

The spelling of 66406274 in words is "sixty-six million, four hundred six thousand, two hundred seventy-four".