66440277 has 16 divisors (see below), whose sum is σ = 98562880. Its totient is φ = 44233776.

The previous prime is 66440273. The next prime is 66440287. The reversal of 66440277 is 77204466.

66440277 is a `hidden beast` number, since 6 + 644 + 0 + 2 + 7 + 7 = 666.

It is not a de Polignac number, because 66440277 - 2² = 66440273 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66440273) 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, 29058 + ... + 31260.

It is an arithmetic number, because the mean of its divisors is an integer number (6160180).

Almost surely, 2^66440277 is an apocalyptic number.

It is an amenable number.

66440277 is a deficient number, since it is larger than the sum of its proper divisors (32122603).

66440277 is a wasteful number, since it uses less digits than its factorization.

66440277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329 (or 3323 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 66440277 is about 8151.0905405351. The cubic root of 66440277 is about 405.0206299505.

The spelling of 66440277 in words is "sixty-six million, four hundred forty thousand, two hundred seventy-seven".