51661795071 has 4 divisors (see below), whose sum is σ = 68882393432. Its totient is φ = 34441196712.

The previous prime is 51661795039. The next prime is 51661795099. The reversal of 51661795071 is 17059716615.

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

It is not a de Polignac number, because 51661795071 - 2⁵ = 51661795039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51661795071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51661790071) 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, 8610299176 + ... + 8610299181.

It is an arithmetic number, because the mean of its divisors is an integer number (17220598358).

Almost surely, 2^51661795071 is an apocalyptic number.

51661795071 is a deficient number, since it is larger than the sum of its proper divisors (17220598361).

51661795071 is a wasteful number, since it uses less digits than its factorization.

51661795071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17220598360.

The product of its (nonzero) digits is 396900, while the sum is 48.

The spelling of 51661795071 in words is "fifty-one billion, six hundred sixty-one million, seven hundred ninety-five thousand, seventy-one".