66448457 has 2 divisors, whose sum is σ = 66448458. Its totient is φ = 66448456.

The previous prime is 66448451. The next prime is 66448463. The reversal of 66448457 is 75484466.

It is a balanced prime because it is at equal distance from previous prime (66448451) and next prime (66448463).

It can be written as a sum of positive squares in only one way, i.e., 34762816 + 31685641 = 5896^2 + 5629^2 .

It is a cyclic number.

It is not a de Polignac number, because 66448457 - 2⁴ = 66448441 is a prime.

It is not a weakly prime, because it can be changed into another prime (66448451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33224228 + 33224229.

It is an arithmetic number, because the mean of its divisors is an integer number (33224229).

Almost surely, 2^66448457 is an apocalyptic number.

It is an amenable number.

66448457 is a deficient number, since it is larger than the sum of its proper divisors (1).

66448457 is an equidigital number, since it uses as much as digits as its factorization.

66448457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 44.

The square root of 66448457 is about 8151.5922984408. The cubic root of 66448457 is about 405.0372510572.

The spelling of 66448457 in words is "sixty-six million, four hundred forty-eight thousand, four hundred fifty-seven".