66280313 has 16 divisors (see below), whose sum is σ = 74475072. Its totient is φ = 58464000.

The previous prime is 66280309. The next prime is 66280321. The reversal of 66280313 is 31308266.

It is a cyclic number.

It is not a de Polignac number, because 66280313 - 2² = 66280309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66280363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126470 + ... + 126992.

It is an arithmetic number, because the mean of its divisors is an integer number (4654692).

Almost surely, 2^66280313 is an apocalyptic number.

It is an amenable number.

66280313 is a deficient number, since it is larger than the sum of its proper divisors (8194759).

66280313 is a wasteful number, since it uses less digits than its factorization.

66280313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 66280313 is about 8141.2721978816. The cubic root of 66280313 is about 404.6953213249.

Adding to 66280313 its reverse (31308266), we get a palindrome (97588579).

The spelling of 66280313 in words is "sixty-six million, two hundred eighty thousand, three hundred thirteen".