66403363 has 4 divisors (see below), whose sum is σ = 71511328. Its totient is φ = 61295400.

The previous prime is 66403349. The next prime is 66403373. The reversal of 66403363 is 36330466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36330466 = 2 ⋅18165233.

It is a cyclic number.

It is not a de Polignac number, because 66403363 - 2⁹ = 66402851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66403373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2553963 + ... + 2553988.

It is an arithmetic number, because the mean of its divisors is an integer number (17877832).

Almost surely, 2^66403363 is an apocalyptic number.

66403363 is a deficient number, since it is larger than the sum of its proper divisors (5107965).

66403363 is a wasteful number, since it uses less digits than its factorization.

66403363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107964.

The product of its (nonzero) digits is 23328, while the sum is 31.

The square root of 66403363 is about 8148.8258663442. The cubic root of 66403363 is about 404.9456066767.

It can be divided in two parts, 66403 and 363, that added together give a palindrome (66766).

The spelling of 66403363 in words is "sixty-six million, four hundred three thousand, three hundred sixty-three".