51178742247 has 16 divisors (see below), whose sum is σ = 71846965760. Its totient is φ = 32315697792.

The previous prime is 51178742221. The next prime is 51178742257. The reversal of 51178742247 is 74224787115.

It is not a de Polignac number, because 51178742247 - 2¹¹ = 51178740199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51178742196 and 51178742205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51178742257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138498 + ... + 348624.

It is an arithmetic number, because the mean of its divisors is an integer number (4490435360).

Almost surely, 2^51178742247 is an apocalyptic number.

51178742247 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

51178742247 is a deficient number, since it is larger than the sum of its proper divisors (20668223513).

51178742247 is a wasteful number, since it uses less digits than its factorization.

51178742247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214422.

The product of its digits is 878080, while the sum is 48.

The spelling of 51178742247 in words is "fifty-one billion, one hundred seventy-eight million, seven hundred forty-two thousand, two hundred forty-seven".