66015427 has 4 divisors (see below), whose sum is σ = 66180456. Its totient is φ = 65850400.

The previous prime is 66015421. The next prime is 66015431. The reversal of 66015427 is 72451066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66015427 - 2³ = 66015419 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66015421) 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, 81913 + ... + 82714.

It is an arithmetic number, because the mean of its divisors is an integer number (16545114).

Almost surely, 2^66015427 is an apocalyptic number.

66015427 is a deficient number, since it is larger than the sum of its proper divisors (165029).

66015427 is a wasteful number, since it uses less digits than its factorization.

66015427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165028.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 66015427 is about 8124.9878153755. The cubic root of 66015427 is about 404.1554865839.

The spelling of 66015427 in words is "sixty-six million, fifteen thousand, four hundred twenty-seven".