51660001 has 8 divisors (see below), whose sum is σ = 54924480. Its totient is φ = 48480432.

The previous prime is 51659989. The next prime is 51660017. The reversal of 51660001 is 10006615.

51660001 is nontrivially palindromic in base 3.

51660001 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

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 51660001 - 2⁷ = 51659873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51660701) 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, 19971 + ... + 22408.

It is an arithmetic number, because the mean of its divisors is an integer number (6865560).

Almost surely, 2^51660001 is an apocalyptic number.

It is an amenable number.

51660001 is a deficient number, since it is larger than the sum of its proper divisors (3264479).

51660001 is a wasteful number, since it uses less digits than its factorization.

51660001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42455.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 51660001 is about 7187.4891999919. The cubic root of 51660001 is about 372.4358425907.

Adding to 51660001 its reverse (10006615), we get a palindrome (61666616).

The spelling of 51660001 in words is "fifty-one million, six hundred sixty thousand, one".