66875491 has 2 divisors, whose sum is σ = 66875492. Its totient is φ = 66875490.

The previous prime is 66875461. The next prime is 66875503. The reversal of 66875491 is 19457866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66875491 - 2⁹ = 66874979 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (66875411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33437745 + 33437746.

It is an arithmetic number, because the mean of its divisors is an integer number (33437746).

Almost surely, 2^66875491 is an apocalyptic number.

66875491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66875491 is an equidigital number, since it uses as much as digits as its factorization.

66875491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 66875491 is about 8177.7436374589. The cubic root of 66875491 is about 405.9030623478.

The spelling of 66875491 in words is "sixty-six million, eight hundred seventy-five thousand, four hundred ninety-one".