20757575009 has 2 divisors, whose sum is σ = 20757575010. Its totient is φ = 20757575008.

The previous prime is 20757574969. The next prime is 20757575011. The reversal of 20757575009 is 90057575702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13752721984 + 7004853025 = 117272^2 + 83695^2 .

It is a cyclic number.

It is not a de Polignac number, because 20757575009 - 2¹² = 20757570913 is a prime.

It is a super-2 number, since 2×20757575009² (a number of 21 digits) contains 22 as substring.

Together with 20757575011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20757575089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10378787504 + 10378787505.

It is an arithmetic number, because the mean of its divisors is an integer number (10378787505).

Almost surely, 2^20757575009 is an apocalyptic number.

It is an amenable number.

20757575009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20757575009 is an equidigital number, since it uses as much as digits as its factorization.

20757575009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 771750, while the sum is 47.

The spelling of 20757575009 in words is "twenty billion, seven hundred fifty-seven million, five hundred seventy-five thousand, nine".