51997754999 has 2 divisors, whose sum is σ = 51997755000. Its totient is φ = 51997754998.

The previous prime is 51997754987. The next prime is 51997755127. The reversal of 51997754999 is 99945779915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51997754999 - 2¹⁶ = 51997689463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51997754909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25998877499 + 25998877500.

It is an arithmetic number, because the mean of its divisors is an integer number (25998877500).

Almost surely, 2^51997754999 is an apocalyptic number.

51997754999 is a deficient number, since it is larger than the sum of its proper divisors (1).

51997754999 is an equidigital number, since it uses as much as digits as its factorization.

51997754999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 289340100, while the sum is 74.

The spelling of 51997754999 in words is "fifty-one billion, nine hundred ninety-seven million, seven hundred fifty-four thousand, nine hundred ninety-nine".