66215437 has 8 divisors (see below), whose sum is σ = 69796800. Its totient is φ = 62643744.

The previous prime is 66215431. The next prime is 66215441. The reversal of 66215437 is 73451266.

It is a happy number.

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 66215437 - 2⁷ = 66215309 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 (66215431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14889 + ... + 18817.

It is an arithmetic number, because the mean of its divisors is an integer number (8724600).

Almost surely, 2^66215437 is an apocalyptic number.

It is an amenable number.

66215437 is a deficient number, since it is larger than the sum of its proper divisors (3581363).

66215437 is a wasteful number, since it uses less digits than its factorization.

66215437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4835.

The product of its digits is 30240, while the sum is 34.

The square root of 66215437 is about 8137.2868328455. The cubic root of 66215437 is about 404.5632379385.

The spelling of 66215437 in words is "sixty-six million, two hundred fifteen thousand, four hundred thirty-seven".