51666010001 has 4 divisors (see below), whose sum is σ = 51670337904. Its totient is φ = 51661682100.

The previous prime is 51666009991. The next prime is 51666010051. The reversal of 51666010001 is 10001066615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51666010001 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 (51666010051) 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 3 ways as a sum of consecutive naturals, for example, 2145995 + ... + 2169936.

It is an arithmetic number, because the mean of its divisors is an integer number (12917584476).

Almost surely, 2^51666010001 is an apocalyptic number.

It is an amenable number.

51666010001 is a deficient number, since it is larger than the sum of its proper divisors (4327903).

51666010001 is a wasteful number, since it uses less digits than its factorization.

51666010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4327902.

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 51666010001 its reverse (10001066615), we get a palindrome (61667076616).

The spelling of 51666010001 in words is "fifty-one billion, six hundred sixty-six million, ten thousand, one".