66449437 has 2 divisors, whose sum is σ = 66449438. Its totient is φ = 66449436.

The previous prime is 66449431. The next prime is 66449497. The reversal of 66449437 is 73494466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66243321 + 206116 = 8139^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 66449437 - 2²³ = 58060829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66449393 and 66449402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66449431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33224718 + 33224719.

It is an arithmetic number, because the mean of its divisors is an integer number (33224719).

Almost surely, 2^66449437 is an apocalyptic number.

It is an amenable number.

66449437 is a deficient number, since it is larger than the sum of its proper divisors (1).

66449437 is an equidigital number, since it uses as much as digits as its factorization.

66449437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 43.

The square root of 66449437 is about 8151.6524091745. The cubic root of 66449437 is about 405.0392422474.

The spelling of 66449437 in words is "sixty-six million, four hundred forty-nine thousand, four hundred thirty-seven".