11620665509 has 2 divisors, whose sum is σ = 11620665510. Its totient is φ = 11620665508.

The previous prime is 11620665473. The next prime is 11620665631. The reversal of 11620665509 is 90556602611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10399512484 + 1221153025 = 101978^2 + 34945^2 .

It is a cyclic number.

It is not a de Polignac number, because 11620665509 - 2²⁰ = 11619616933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11620662509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5810332754 + 5810332755.

It is an arithmetic number, because the mean of its divisors is an integer number (5810332755).

Almost surely, 2^11620665509 is an apocalyptic number.

It is an amenable number.

11620665509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11620665509 is an equidigital number, since it uses as much as digits as its factorization.

11620665509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The spelling of 11620665509 in words is "eleven billion, six hundred twenty million, six hundred sixty-five thousand, five hundred nine".