66854705 has 12 divisors (see below), whose sum is σ = 80959860. Its totient is φ = 52998624.

The previous prime is 66854701. The next prime is 66854713. The reversal of 66854705 is 50745866.

It can be written as a sum of positive squares in 2 ways, for example, as 31225744 + 35628961 = 5588^2 + 5969^2 .

It is not a de Polignac number, because 66854705 - 2² = 66854701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66854701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80231 + ... + 81059.

It is an arithmetic number, because the mean of its divisors is an integer number (6746655).

Almost surely, 2^66854705 is an apocalyptic number.

It is an amenable number.

66854705 is a deficient number, since it is larger than the sum of its proper divisors (14105155).

66854705 is an equidigital number, since it uses as much as digits as its factorization.

66854705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088 (or 961 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 66854705 is about 8176.4726502325. The cubic root of 66854705 is about 405.8610042125.

The spelling of 66854705 in words is "sixty-six million, eight hundred fifty-four thousand, seven hundred five".