201000009660509 has 2 divisors, whose sum is σ = 201000009660510. Its totient is φ = 201000009660508.

The previous prime is 201000009660407. The next prime is 201000009660589. The reversal of 201000009660509 is 905066900000102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134927855064025 + 66072154596484 = 11615845^2 + 8128478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201000009660509 is a prime.

It is a super-2 number, since 2×201000009660509² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201000009660589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100500004830254 + 100500004830255.

It is an arithmetic number, because the mean of its divisors is an integer number (100500004830255).

Almost surely, 2^{201000009660509} is an apocalyptic number.

It is an amenable number.

201000009660509 is a deficient number, since it is larger than the sum of its proper divisors (1).

201000009660509 is an equidigital number, since it uses as much as digits as its factorization.

201000009660509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The spelling of 201000009660509 in words is "two hundred one trillion, nine million, six hundred sixty thousand, five hundred nine".