9972089606509 has 2 divisors, whose sum is σ = 9972089606510. Its totient is φ = 9972089606508.

The previous prime is 9972089606461. The next prime is 9972089606533. The reversal of 9972089606509 is 9056069802799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7937444118409 + 2034645488100 = 2817347^2 + 1426410^2 .

It is a cyclic number.

It is not a de Polignac number, because 9972089606509 - 2⁹ = 9972089605997 is a prime.

It is a super-2 number, since 2×9972089606509² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9972089606209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4986044803254 + 4986044803255.

It is an arithmetic number, because the mean of its divisors is an integer number (4986044803255).

Almost surely, 2^{9972089606509} is an apocalyptic number.

It is an amenable number.

9972089606509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9972089606509 is an equidigital number, since it uses as much as digits as its factorization.

9972089606509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132269760, while the sum is 70.

The spelling of 9972089606509 in words is "nine trillion, nine hundred seventy-two billion, eighty-nine million, six hundred six thousand, five hundred nine".