66457693 has 2 divisors, whose sum is σ = 66457694. Its totient is φ = 66457692.

The previous prime is 66457691. The next prime is 66457751. The reversal of 66457693 is 39675466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59259204 + 7198489 = 7698^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 66457693 - 2¹ = 66457691 is a prime.

Together with 66457691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66457691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33228846 + 33228847.

It is an arithmetic number, because the mean of its divisors is an integer number (33228847).

Almost surely, 2^66457693 is an apocalyptic number.

It is an amenable number.

66457693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66457693 is an equidigital number, since it uses as much as digits as its factorization.

66457693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 46.

The square root of 66457693 is about 8152.1587938411. The cubic root of 66457693 is about 405.0560162320.

The spelling of 66457693 in words is "sixty-six million, four hundred fifty-seven thousand, six hundred ninety-three".