155909228009 has 2 divisors, whose sum is σ = 155909228010. Its totient is φ = 155909228008.

The previous prime is 155909227993. The next prime is 155909228087. The reversal of 155909228009 is 900822909551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155908891609 + 336400 = 394853^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 155909228009 - 2⁴ = 155909227993 is a prime.

It is not a weakly prime, because it can be changed into another prime (155909228809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77954614004 + 77954614005.

It is an arithmetic number, because the mean of its divisors is an integer number (77954614005).

Almost surely, 2^155909228009 is an apocalyptic number.

It is an amenable number.

155909228009 is a deficient number, since it is larger than the sum of its proper divisors (1).

155909228009 is an equidigital number, since it uses as much as digits as its factorization.

155909228009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 50.

The spelling of 155909228009 in words is "one hundred fifty-five billion, nine hundred nine million, two hundred twenty-eight thousand, nine".