51695543785 has 8 divisors (see below), whose sum is σ = 62037106056. Its totient is φ = 41354799360.

The previous prime is 51695543777. The next prime is 51695543803. The reversal of 51695543785 is 58734559615.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1940226304 + 49755317481 = 44048^2 + 223059^2 .

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

It is not a de Polignac number, because 51695543785 - 2³ = 51695543777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 55536 + ... + 326305.

It is an arithmetic number, because the mean of its divisors is an integer number (7754638257).

Almost surely, 2^51695543785 is an apocalyptic number.

It is an amenable number.

51695543785 is a deficient number, since it is larger than the sum of its proper divisors (10341562271).

51695543785 is a wasteful number, since it uses less digits than its factorization.

51695543785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408923.

The product of its digits is 22680000, while the sum is 58.

The spelling of 51695543785 in words is "fifty-one billion, six hundred ninety-five million, five hundred forty-three thousand, seven hundred eighty-five".