66474647 has 2 divisors, whose sum is σ = 66474648. Its totient is φ = 66474646.

The previous prime is 66474599. The next prime is 66474649. The reversal of 66474647 is 74647466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66474647 - 2¹⁶ = 66409111 is a prime.

Together with 66474649, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66474598 and 66474607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66474649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33237323 + 33237324.

It is an arithmetic number, because the mean of its divisors is an integer number (33237324).

Almost surely, 2^66474647 is an apocalyptic number.

66474647 is a deficient number, since it is larger than the sum of its proper divisors (1).

66474647 is an equidigital number, since it uses as much as digits as its factorization.

66474647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 44.

The square root of 66474647 is about 8153.1985747926. The cubic root of 66474647 is about 405.0904578720.

The spelling of 66474647 in words is "sixty-six million, four hundred seventy-four thousand, six hundred forty-seven".