66971437 has 8 divisors (see below), whose sum is σ = 72235800. Its totient is φ = 61723200.

The previous prime is 66971413. The next prime is 66971459. The reversal of 66971437 is 73417966.

It can be written as a sum of positive squares in 4 ways, for example, as 15217801 + 51753636 = 3901^2 + 7194^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66971437 - 2⁷ = 66971309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66971393 and 66971402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66974437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5439 + ... + 12787.

It is an arithmetic number, because the mean of its divisors is an integer number (9029475).

Almost surely, 2^66971437 is an apocalyptic number.

It is an amenable number.

66971437 is a deficient number, since it is larger than the sum of its proper divisors (5264363).

66971437 is a wasteful number, since it uses less digits than its factorization.

66971437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8063.

The product of its digits is 190512, while the sum is 43.

The square root of 66971437 is about 8183.6078229593. The cubic root of 66971437 is about 406.0970854238.

The spelling of 66971437 in words is "sixty-six million, nine hundred seventy-one thousand, four hundred thirty-seven".