66553403 has 8 divisors (see below), whose sum is σ = 76366080. Its totient is φ = 56817000.

The previous prime is 66553391. The next prime is 66553423. The reversal of 66553403 is 30435566.

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 66553403 - 2⁴ = 66553387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66553403.

It is not an unprimeable number, because it can be changed into a prime (66553423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17183 + ... + 20696.

It is an arithmetic number, because the mean of its divisors is an integer number (9545760).

Almost surely, 2^66553403 is an apocalyptic number.

66553403 is a deficient number, since it is larger than the sum of its proper divisors (9812677).

66553403 is a wasteful number, since it uses less digits than its factorization.

66553403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38137.

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 66553403 is about 8158.0269060601. The cubic root of 66553403 is about 405.2503720381.

Adding to 66553403 its reverse (30435566), we get a palindrome (96988969).

The spelling of 66553403 in words is "sixty-six million, five hundred fifty-three thousand, four hundred three".