54940806509 has 2 divisors, whose sum is σ = 54940806510. Its totient is φ = 54940806508.

The previous prime is 54940806497. The next prime is 54940806527. The reversal of 54940806509 is 90560804945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54926953225 + 13853284 = 234365^2 + 3722^2 .

It is a cyclic number.

It is not a de Polignac number, because 54940806509 - 2⁴ = 54940806493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54940806409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27470403254 + 27470403255.

It is an arithmetic number, because the mean of its divisors is an integer number (27470403255).

Almost surely, 2^54940806509 is an apocalyptic number.

It is an amenable number.

54940806509 is a deficient number, since it is larger than the sum of its proper divisors (1).

54940806509 is an equidigital number, since it uses as much as digits as its factorization.

54940806509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 54940806509 in words is "fifty-four billion, nine hundred forty million, eight hundred six thousand, five hundred nine".