66372547 has 2 divisors, whose sum is σ = 66372548. Its totient is φ = 66372546.

The previous prime is 66372517. The next prime is 66372557. The reversal of 66372547 is 74527366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66372547 is a prime.

It is not a weakly prime, because it can be changed into another prime (66372517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33186273 + 33186274.

It is an arithmetic number, because the mean of its divisors is an integer number (33186274).

Almost surely, 2^66372547 is an apocalyptic number.

66372547 is a deficient number, since it is larger than the sum of its proper divisors (1).

66372547 is an equidigital number, since it uses as much as digits as its factorization.

66372547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 40.

The square root of 66372547 is about 8146.9348223734. The cubic root of 66372547 is about 404.8829555593.

The spelling of 66372547 in words is "sixty-six million, three hundred seventy-two thousand, five hundred forty-seven".