20475761249 has 2 divisors, whose sum is σ = 20475761250. Its totient is φ = 20475761248.

The previous prime is 20475761239. The next prime is 20475761263. The reversal of 20475761249 is 94216757402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17531613649 + 2944147600 = 132407^2 + 54260^2 .

It is a cyclic number.

It is not a de Polignac number, because 20475761249 - 2⁴ = 20475761233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20475761219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10237880624 + 10237880625.

It is an arithmetic number, because the mean of its divisors is an integer number (10237880625).

Almost surely, 2^20475761249 is an apocalyptic number.

It is an amenable number.

20475761249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20475761249 is an equidigital number, since it uses as much as digits as its factorization.

20475761249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 20475761249 in words is "twenty billion, four hundred seventy-five million, seven hundred sixty-one thousand, two hundred forty-nine".