66854791 has 2 divisors, whose sum is σ = 66854792. Its totient is φ = 66854790.

The previous prime is 66854747. The next prime is 66854861. The reversal of 66854791 is 19745866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66854791 - 2⁷ = 66854663 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66854701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427395 + 33427396.

It is an arithmetic number, because the mean of its divisors is an integer number (33427396).

Almost surely, 2^66854791 is an apocalyptic number.

66854791 is a deficient number, since it is larger than the sum of its proper divisors (1).

66854791 is an equidigital number, since it uses as much as digits as its factorization.

66854791 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 66854791 is about 8176.4779092223. The cubic root of 66854791 is about 405.8611782418.

It can be divided in two parts, 6685 and 4791, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 66854791 in words is "sixty-six million, eight hundred fifty-four thousand, seven hundred ninety-one".