51415781723 has 2 divisors, whose sum is σ = 51415781724. Its totient is φ = 51415781722.

The previous prime is 51415781701. The next prime is 51415781771. The reversal of 51415781723 is 32718751415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51415781723 - 2²⁰ = 51414733147 is a prime.

It is a super-2 number, since 2×51415781723² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51415781783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25707890861 + 25707890862.

It is an arithmetic number, because the mean of its divisors is an integer number (25707890862).

Almost surely, 2^51415781723 is an apocalyptic number.

51415781723 is a deficient number, since it is larger than the sum of its proper divisors (1).

51415781723 is an equidigital number, since it uses as much as digits as its factorization.

51415781723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 44.

The spelling of 51415781723 in words is "fifty-one billion, four hundred fifteen million, seven hundred eighty-one thousand, seven hundred twenty-three".