66277493 has 2 divisors, whose sum is σ = 66277494. Its totient is φ = 66277492.

The previous prime is 66277489. The next prime is 66277517. The reversal of 66277493 is 39477266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52896529 + 13380964 = 7273^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 66277493 - 2² = 66277489 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66277403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33138746 + 33138747.

It is an arithmetic number, because the mean of its divisors is an integer number (33138747).

Almost surely, 2^66277493 is an apocalyptic number.

It is an amenable number.

66277493 is a deficient number, since it is larger than the sum of its proper divisors (1).

66277493 is an equidigital number, since it uses as much as digits as its factorization.

66277493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 44.

The square root of 66277493 is about 8141.0990044342. The cubic root of 66277493 is about 404.6895817775.

The spelling of 66277493 in words is "sixty-six million, two hundred seventy-seven thousand, four hundred ninety-three".