66037321 has 8 divisors (see below), whose sum is σ = 78073920. Its totient is φ = 54651408.

The previous prime is 66037291. The next prime is 66037327. The reversal of 66037321 is 12373066.

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

It is not a de Polignac number, because 66037321 - 2⁵ = 66037289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66037321.

It is not an unprimeable number, because it can be changed into a prime (66037327) 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, 162451 + ... + 162856.

It is an arithmetic number, because the mean of its divisors is an integer number (9759240).

Almost surely, 2^66037321 is an apocalyptic number.

It is an amenable number.

66037321 is a deficient number, since it is larger than the sum of its proper divisors (12036599).

66037321 is a wasteful number, since it uses less digits than its factorization.

66037321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325343.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 66037321 is about 8126.3350287814. The cubic root of 66037321 is about 404.2001610012.

It can be divided in two parts, 6603 and 7321, that added together give a square (13924 = 118²).

The spelling of 66037321 in words is "sixty-six million, thirty-seven thousand, three hundred twenty-one".