66403601 has 8 divisors (see below), whose sum is σ = 73012224. Its totient is φ = 59890320.

The previous prime is 66403583. The next prime is 66403607. The reversal of 66403601 is 10630466.

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 66403601 - 2¹⁸ = 66141457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66403607) 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, 22370 + ... + 25163.

It is an arithmetic number, because the mean of its divisors is an integer number (9126528).

Almost surely, 2^66403601 is an apocalyptic number.

It is an amenable number.

66403601 is a deficient number, since it is larger than the sum of its proper divisors (6608623).

66403601 is a wasteful number, since it uses less digits than its factorization.

66403601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47671.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66403601 is about 8148.8404696619. The cubic root of 66403601 is about 404.9460904721.

The spelling of 66403601 in words is "sixty-six million, four hundred three thousand, six hundred one".