50997696509 has 2 divisors, whose sum is σ = 50997696510. Its totient is φ = 50997696508.

The previous prime is 50997696493. The next prime is 50997696571. The reversal of 50997696509 is 90569679905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46019688484 + 4978008025 = 214522^2 + 70555^2 .

It is a cyclic number.

It is not a de Polignac number, because 50997696509 - 2⁴ = 50997696493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50997696809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25498848254 + 25498848255.

It is an arithmetic number, because the mean of its divisors is an integer number (25498848255).

Almost surely, 2^50997696509 is an apocalyptic number.

It is an amenable number.

50997696509 is a deficient number, since it is larger than the sum of its proper divisors (1).

50997696509 is an equidigital number, since it uses as much as digits as its factorization.

50997696509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41334300, while the sum is 65.

The spelling of 50997696509 in words is "fifty billion, nine hundred ninety-seven million, six hundred ninety-six thousand, five hundred nine".