66534571 has 2 divisors, whose sum is σ = 66534572. Its totient is φ = 66534570.

The previous prime is 66534553. The next prime is 66534577. The reversal of 66534571 is 17543566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66534571 - 2⁹ = 66534059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66534571.

It is not a weakly prime, because it can be changed into another prime (66534577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33267285 + 33267286.

It is an arithmetic number, because the mean of its divisors is an integer number (33267286).

Almost surely, 2^66534571 is an apocalyptic number.

66534571 is a deficient number, since it is larger than the sum of its proper divisors (1).

66534571 is an equidigital number, since it uses as much as digits as its factorization.

66534571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 37.

The square root of 66534571 is about 8156.8726237450. The cubic root of 66534571 is about 405.2121451175.

The spelling of 66534571 in words is "sixty-six million, five hundred thirty-four thousand, five hundred seventy-one".