51694751519 has 2 divisors, whose sum is σ = 51694751520. Its totient is φ = 51694751518.

The previous prime is 51694751441. The next prime is 51694751527. The reversal of 51694751519 is 91515749615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51694751519 is a prime.

It is a super-2 number, since 2×51694751519² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51694750519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25847375759 + 25847375760.

It is an arithmetic number, because the mean of its divisors is an integer number (25847375760).

Almost surely, 2^51694751519 is an apocalyptic number.

51694751519 is a deficient number, since it is larger than the sum of its proper divisors (1).

51694751519 is an equidigital number, since it uses as much as digits as its factorization.

51694751519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701000, while the sum is 53.

The spelling of 51694751519 in words is "fifty-one billion, six hundred ninety-four million, seven hundred fifty-one thousand, five hundred nineteen".