66072547 has 2 divisors, whose sum is σ = 66072548. Its totient is φ = 66072546.

The previous prime is 66072521. The next prime is 66072581. The reversal of 66072547 is 74527066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66072547 - 2²³ = 57683939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66072247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33036273 + 33036274.

It is an arithmetic number, because the mean of its divisors is an integer number (33036274).

Almost surely, 2^66072547 is an apocalyptic number.

66072547 is a deficient number, since it is larger than the sum of its proper divisors (1).

66072547 is an equidigital number, since it uses as much as digits as its factorization.

66072547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 66072547 is about 8128.5021375405. The cubic root of 66072547 is about 404.2720184685.

The spelling of 66072547 in words is "sixty-six million, seventy-two thousand, five hundred forty-seven".