66280049 has 6 divisors (see below), whose sum is σ = 72853410. Its totient is φ = 60254480.

The previous prime is 66280021. The next prime is 66280079. The reversal of 66280049 is 94008266.

It can be written as a sum of positive squares in only one way, i.e., 66259600 + 20449 = 8140^2 + 143^2 .

It is not a de Polignac number, because 66280049 - 2⁸ = 66279793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66280079) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 273764 + ... + 274005.

It is an arithmetic number, because the mean of its divisors is an integer number (12142235).

Almost surely, 2^66280049 is an apocalyptic number.

It is an amenable number.

66280049 is a deficient number, since it is larger than the sum of its proper divisors (6573361).

66280049 is a wasteful number, since it uses less digits than its factorization.

66280049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547791 (or 547780 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 66280049 is about 8141.2559841833. The cubic root of 66280049 is about 404.6947840124.

The spelling of 66280049 in words is "sixty-six million, two hundred eighty thousand, forty-nine".