66634403 has 8 divisors (see below), whose sum is σ = 72808176. Its totient is φ = 60480000.

The previous prime is 66634397. The next prime is 66634417. The reversal of 66634403 is 30443666.

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 66634403 - 2⁸ = 66634147 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 66634403.

It is not an unprimeable number, because it can be changed into a prime (66634453) 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, 2903 + ... + 11903.

It is an arithmetic number, because the mean of its divisors is an integer number (9101022).

Almost surely, 2^66634403 is an apocalyptic number.

66634403 is a deficient number, since it is larger than the sum of its proper divisors (6173773).

66634403 is a wasteful number, since it uses less digits than its factorization.

66634403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9685.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 66634403 is about 8162.9898321632. The cubic root of 66634403 is about 405.4147111041.

The spelling of 66634403 in words is "sixty-six million, six hundred thirty-four thousand, four hundred three".