51693930551 has 2 divisors, whose sum is σ = 51693930552. Its totient is φ = 51693930550.

The previous prime is 51693930523. The next prime is 51693930571. The reversal of 51693930551 is 15503939615.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51693930551 is a prime.

It is a super-2 number, since 2×51693930551² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 51693930496 and 51693930505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51693930511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25846965275 + 25846965276.

It is an arithmetic number, because the mean of its divisors is an integer number (25846965276).

Almost surely, 2^51693930551 is an apocalyptic number.

51693930551 is a deficient number, since it is larger than the sum of its proper divisors (1).

51693930551 is an equidigital number, since it uses as much as digits as its factorization.

51693930551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 546750, while the sum is 47.

The spelling of 51693930551 in words is "fifty-one billion, six hundred ninety-three million, nine hundred thirty thousand, five hundred fifty-one".