66415147 has 2 divisors, whose sum is σ = 66415148. Its totient is φ = 66415146.

The previous prime is 66415079. The next prime is 66415159. The reversal of 66415147 is 74151466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66415147 is a prime.

It is not a weakly prime, because it can be changed into another prime (66415187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33207573 + 33207574.

It is an arithmetic number, because the mean of its divisors is an integer number (33207574).

Almost surely, 2^66415147 is an apocalyptic number.

66415147 is a deficient number, since it is larger than the sum of its proper divisors (1).

66415147 is an equidigital number, since it uses as much as digits as its factorization.

66415147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 66415147 is about 8149.5488832205. The cubic root of 66415147 is about 404.9695592626.

The spelling of 66415147 in words is "sixty-six million, four hundred fifteen thousand, one hundred forty-seven".