66360439 has 4 divisors (see below), whose sum is σ = 68648760. Its totient is φ = 64072120.

The previous prime is 66360403. The next prime is 66360443. The reversal of 66360439 is 93406366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93406366 = 2 ⋅46703183.

It is a cyclic number.

It is not a de Polignac number, because 66360439 - 2¹⁵ = 66327671 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66360398 and 66360407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66360479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1144117 + ... + 1144174.

It is an arithmetic number, because the mean of its divisors is an integer number (17162190).

Almost surely, 2^66360439 is an apocalyptic number.

66360439 is a deficient number, since it is larger than the sum of its proper divisors (2288321).

66360439 is a wasteful number, since it uses less digits than its factorization.

66360439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288320.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 66360439 is about 8146.1916869173. The cubic root of 66360439 is about 404.8583338285.

The spelling of 66360439 in words is "sixty-six million, three hundred sixty thousand, four hundred thirty-nine".