66921235 has 8 divisors (see below), whose sum is σ = 80394336. Its totient is φ = 53477760.

The previous prime is 66921233. The next prime is 66921247. The reversal of 66921235 is 53212966.

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

It is not a de Polignac number, because 66921235 - 2¹ = 66921233 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 66921235.

It is not an unprimeable number, because it can be changed into a prime (66921233) 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, 2086 + ... + 11755.

It is an arithmetic number, because the mean of its divisors is an integer number (10049292).

Almost surely, 2^66921235 is an apocalyptic number.

66921235 is a deficient number, since it is larger than the sum of its proper divisors (13473101).

66921235 is a wasteful number, since it uses less digits than its factorization.

66921235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14813.

The product of its digits is 19440, while the sum is 34.

The square root of 66921235 is about 8180.5400188496. The cubic root of 66921235 is about 405.9955895078.

It can be divided in two parts, 669 and 21235, that added together give a square (21904 = 148²).

The spelling of 66921235 in words is "sixty-six million, nine hundred twenty-one thousand, two hundred thirty-five".