51165001651 has 4 divisors (see below), whose sum is σ = 51739889400. Its totient is φ = 50590113904.

The previous prime is 51165001631. The next prime is 51165001729. The reversal of 51165001651 is 15610056115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51165001651 - 2⁵ = 51165001619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51165001631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287443741 + ... + 287443918.

It is an arithmetic number, because the mean of its divisors is an integer number (12934972350).

Almost surely, 2^51165001651 is an apocalyptic number.

51165001651 is a deficient number, since it is larger than the sum of its proper divisors (574887749).

51165001651 is an equidigital number, since it uses as much as digits as its factorization.

51165001651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574887748.

The product of its (nonzero) digits is 4500, while the sum is 31.

Adding to 51165001651 its reverse (15610056115), we get a palindrome (66775057766).

The spelling of 51165001651 in words is "fifty-one billion, one hundred sixty-five million, one thousand, six hundred fifty-one".