66571007 has 2 divisors, whose sum is σ = 66571008. Its totient is φ = 66571006.

The previous prime is 66570991. The next prime is 66571033. The reversal of 66571007 is 70017566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66571007 - 2⁴ = 66570991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66571097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33285503 + 33285504.

It is an arithmetic number, because the mean of its divisors is an integer number (33285504).

Almost surely, 2^66571007 is an apocalyptic number.

66571007 is a deficient number, since it is larger than the sum of its proper divisors (1).

66571007 is an equidigital number, since it uses as much as digits as its factorization.

66571007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 66571007 is about 8159.1057720807. The cubic root of 66571007 is about 405.2860997310.

The spelling of 66571007 in words is "sixty-six million, five hundred seventy-one thousand, seven".