66380403 has 8 divisors (see below), whose sum is σ = 90390528. Its totient is φ = 43311944.

The previous prime is 66380401. The next prime is 66380417. The reversal of 66380403 is 30408366.

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 66380403 - 2¹ = 66380401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66380401) 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, 235251 + ... + 235532.

It is an arithmetic number, because the mean of its divisors is an integer number (11298816).

Almost surely, 2^66380403 is an apocalyptic number.

66380403 is a deficient number, since it is larger than the sum of its proper divisors (24010125).

66380403 is a wasteful number, since it uses less digits than its factorization.

66380403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470833.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 66380403 is about 8147.4169526298. The cubic root of 66380403 is about 404.8989292068.

Adding to 66380403 its reverse (30408366), we get a palindrome (96788769).

The spelling of 66380403 in words is "sixty-six million, three hundred eighty thousand, four hundred three".