51782218815 has 16 divisors (see below), whose sum is σ = 82883368800. Its totient is φ = 27606577152.

The previous prime is 51782218811. The next prime is 51782218931. The reversal of 51782218815 is 51881228715.

It is a happy number.

It is not a de Polignac number, because 51782218815 - 2² = 51782218811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51782218811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 622450 + ... + 700719.

It is an arithmetic number, because the mean of its divisors is an integer number (5180210550).

Almost surely, 2^51782218815 is an apocalyptic number.

51782218815 is a deficient number, since it is larger than the sum of its proper divisors (31101149985).

51782218815 is a wasteful number, since it uses less digits than its factorization.

51782218815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325786.

The product of its digits is 358400, while the sum is 48.

The spelling of 51782218815 in words is "fifty-one billion, seven hundred eighty-two million, two hundred eighteen thousand, eight hundred fifteen".