66438001 has 8 divisors (see below), whose sum is σ = 76088960. Its totient is φ = 56827008.

The previous prime is 66437993. The next prime is 66438059. The reversal of 66438001 is 10083466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66438001 - 2³ = 66437993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66438061) 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, 6336 + ... + 13153.

It is an arithmetic number, because the mean of its divisors is an integer number (9511120).

Almost surely, 2^66438001 is an apocalyptic number.

It is an amenable number.

66438001 is a deficient number, since it is larger than the sum of its proper divisors (9650959).

66438001 is a wasteful number, since it uses less digits than its factorization.

66438001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19983.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66438001 is about 8150.9509261190. The cubic root of 66438001 is about 405.0160050577.

The spelling of 66438001 in words is "sixty-six million, four hundred thirty-eight thousand, one".