51684358499 has 2 divisors, whose sum is σ = 51684358500. Its totient is φ = 51684358498.

The previous prime is 51684358489. The next prime is 51684358547. The reversal of 51684358499 is 99485348615.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51684358499 is a prime.

It is a super-3 number, since 3×51684358499³ (a number of 33 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (51684358489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25842179249 + 25842179250.

It is an arithmetic number, because the mean of its divisors is an integer number (25842179250).

Almost surely, 2^51684358499 is an apocalyptic number.

51684358499 is a deficient number, since it is larger than the sum of its proper divisors (1).

51684358499 is an equidigital number, since it uses as much as digits as its factorization.

51684358499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37324800, while the sum is 62.

The spelling of 51684358499 in words is "fifty-one billion, six hundred eighty-four million, three hundred fifty-eight thousand, four hundred ninety-nine".