155015801609 has 2 divisors, whose sum is σ = 155015801610. Its totient is φ = 155015801608.

The previous prime is 155015801597. The next prime is 155015801683. The reversal of 155015801609 is 906108510551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114934560400 + 40081241209 = 339020^2 + 200203^2 .

It is a cyclic number.

It is not a de Polignac number, because 155015801609 - 2²⁸ = 154747366153 is a prime.

It is not a weakly prime, because it can be changed into another prime (155015801009) 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, 77507900804 + 77507900805.

It is an arithmetic number, because the mean of its divisors is an integer number (77507900805).

Almost surely, 2^155015801609 is an apocalyptic number.

It is an amenable number.

155015801609 is a deficient number, since it is larger than the sum of its proper divisors (1).

155015801609 is an equidigital number, since it uses as much as digits as its factorization.

155015801609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54000, while the sum is 41.

The spelling of 155015801609 in words is "one hundred fifty-five billion, fifteen million, eight hundred one thousand, six hundred nine".