51415781771 has 2 divisors, whose sum is σ = 51415781772. Its totient is φ = 51415781770.

The previous prime is 51415781723. The next prime is 51415781783. The reversal of 51415781771 is 17718751415.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51415781771 is a prime.

It is not a weakly prime, because it can be changed into another prime (51415781701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25707890885 + 25707890886.

It is an arithmetic number, because the mean of its divisors is an integer number (25707890886).

Almost surely, 2^51415781771 is an apocalyptic number.

51415781771 is a deficient number, since it is larger than the sum of its proper divisors (1).

51415781771 is an equidigital number, since it uses as much as digits as its factorization.

51415781771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 274400, while the sum is 47.

The spelling of 51415781771 in words is "fifty-one billion, four hundred fifteen million, seven hundred eighty-one thousand, seven hundred seventy-one".