66181001 has 8 divisors (see below), whose sum is σ = 68818944. Its totient is φ = 63574560.

The previous prime is 66180973. The next prime is 66181007. The reversal of 66181001 is 10018166.

It is a happy number.

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 66181001 - 2⁶ = 66180937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66181007) 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, 3545 + ... + 12038.

It is an arithmetic number, because the mean of its divisors is an integer number (8602368).

Almost surely, 2^66181001 is an apocalyptic number.

It is an amenable number.

66181001 is a deficient number, since it is larger than the sum of its proper divisors (2637943).

66181001 is a wasteful number, since it uses less digits than its factorization.

66181001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15751.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 66181001 is about 8135.1706189852. The cubic root of 66181001 is about 404.4930933918.

Adding to 66181001 its reverse (10018166), we get a palindrome (76199167).

The spelling of 66181001 in words is "sixty-six million, one hundred eighty-one thousand, one".