66511147 has 4 divisors (see below), whose sum is σ = 69402960. Its totient is φ = 63619336.

The previous prime is 66511129. The next prime is 66511177. The reversal of 66511147 is 74111566.

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 66511147 - 2⁷ = 66511019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66511177) 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, 1445872 + ... + 1445917.

It is an arithmetic number, because the mean of its divisors is an integer number (17350740).

Almost surely, 2^66511147 is an apocalyptic number.

66511147 is a deficient number, since it is larger than the sum of its proper divisors (2891813).

66511147 is a wasteful number, since it uses less digits than its factorization.

66511147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891812.

The product of its digits is 5040, while the sum is 31.

The square root of 66511147 is about 8155.4366529328. The cubic root of 66511147 is about 405.1645868671.

The spelling of 66511147 in words is "sixty-six million, five hundred eleven thousand, one hundred forty-seven".