66701857 has 2 divisors, whose sum is σ = 66701858. Its totient is φ = 66701856.

The previous prime is 66701849. The next prime is 66701879. The reversal of 66701857 is 75810766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64786401 + 1915456 = 8049^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 66701857 - 2³ = 66701849 is a prime.

It is not a weakly prime, because it can be changed into another prime (66704857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33350928 + 33350929.

It is an arithmetic number, because the mean of its divisors is an integer number (33350929).

Almost surely, 2^66701857 is an apocalyptic number.

It is an amenable number.

66701857 is a deficient number, since it is larger than the sum of its proper divisors (1).

66701857 is an equidigital number, since it uses as much as digits as its factorization.

66701857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 66701857 is about 8167.1204839894. The cubic root of 66701857 is about 405.5514653939.

The spelling of 66701857 in words is "sixty-six million, seven hundred one thousand, eight hundred fifty-seven".