51216779519 has 2 divisors, whose sum is σ = 51216779520. Its totient is φ = 51216779518.

The previous prime is 51216779503. The next prime is 51216779521. The reversal of 51216779519 is 91597761215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51216779519 - 2⁴ = 51216779503 is a prime.

It is a super-2 number, since 2×51216779519² (a number of 22 digits) contains 22 as substring.

Together with 51216779521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51216773519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25608389759 + 25608389760.

It is an arithmetic number, because the mean of its divisors is an integer number (25608389760).

Almost surely, 2^51216779519 is an apocalyptic number.

51216779519 is a deficient number, since it is larger than the sum of its proper divisors (1).

51216779519 is an equidigital number, since it uses as much as digits as its factorization.

51216779519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1190700, while the sum is 53.

The spelling of 51216779519 in words is "fifty-one billion, two hundred sixteen million, seven hundred seventy-nine thousand, five hundred nineteen".