66204731 has 8 divisors (see below), whose sum is σ = 67836384. Its totient is φ = 64592640.

The previous prime is 66204707. The next prime is 66204739. The reversal of 66204731 is 13740266.

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 66204731 - 2¹⁰ = 66203707 is a prime.

It is a super-2 number, since 2×66204731² = 8766132813564722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66204694 and 66204703.

It is not an unprimeable number, because it can be changed into a prime (66204739) 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, 2081 + ... + 11693.

It is an arithmetic number, because the mean of its divisors is an integer number (8479548).

Almost surely, 2^66204731 is an apocalyptic number.

66204731 is a deficient number, since it is larger than the sum of its proper divisors (1631653).

66204731 is an equidigital number, since it uses as much as digits as its factorization.

66204731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9781.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66204731 is about 8136.6289702800. The cubic root of 66204731 is about 404.5414329150.

Adding to 66204731 its reverse (13740266), we get a palindrome (79944997).

The spelling of 66204731 in words is "sixty-six million, two hundred four thousand, seven hundred thirty-one".