66748339449 has 27 divisors (see below), whose sum is σ = 105989551759. Its totient is φ = 40448371920.

The previous prime is 66748339417. The next prime is 66748339507. The reversal of 66748339449 is 94493384766.

The square root of 66748339449 is 258357.

It is a perfect power (a square), and thus also a powerful number.

66748339449 is a `hidden beast` number, since 6 + 67 + 483 + 3 + 94 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8715529449 + 58032810000 = 93357^2 + 240900^2 .

It is not a de Polignac number, because 66748339449 - 2⁵ = 66748339417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66748339649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8521867 + ... + 8529695.

Almost surely, 2^66748339449 is an apocalyptic number.

66748339449 is the 258357-th square number.

66748339449 is the 129179-th centered octagonal number.

It is an amenable number.

66748339449 is a deficient number, since it is larger than the sum of its proper divisors (39241212310).

66748339449 is an frugal number, since it uses more digits than its factorization.

66748339449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15686 (or 7843 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 63.

The spelling of 66748339449 in words is "sixty-six billion, seven hundred forty-eight million, three hundred thirty-nine thousand, four hundred forty-nine".