66071439 has 24 divisors (see below), whose sum is σ = 110047392. Its totient is φ = 37416960.

The previous prime is 66071431. The next prime is 66071461. The reversal of 66071439 is 93417066.

66071439 is a `hidden beast` number, since 6 + 607 + 1 + 43 + 9 = 666.

It is not a de Polignac number, because 66071439 - 2³ = 66071431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66071431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2479 + ... + 11759.

It is an arithmetic number, because the mean of its divisors is an integer number (4585308).

Almost surely, 2^66071439 is an apocalyptic number.

66071439 is a deficient number, since it is larger than the sum of its proper divisors (43975953).

66071439 is a wasteful number, since it uses less digits than its factorization.

66071439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9407 (or 9404 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 66071439 is about 8128.4339820165. The cubic root of 66071439 is about 404.2697586500.

The spelling of 66071439 in words is "sixty-six million, seventy-one thousand, four hundred thirty-nine".