51511601165 has 8 divisors (see below), whose sum is σ = 61836976608. Its totient is φ = 41193910800.

The previous prime is 51511601147. The next prime is 51511601203. The reversal of 51511601165 is 56110611515.

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

It is not a de Polignac number, because 51511601165 - 2²⁸ = 51243165709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1906511 + ... + 1933340.

It is an arithmetic number, because the mean of its divisors is an integer number (7729622076).

Almost surely, 2^51511601165 is an apocalyptic number.

It is an amenable number.

51511601165 is a deficient number, since it is larger than the sum of its proper divisors (10325375443).

51511601165 is a wasteful number, since it uses less digits than its factorization.

51511601165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3842539.

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 51511601165 in words is "fifty-one billion, five hundred eleven million, six hundred one thousand, one hundred sixty-five".