155866120908959 has 2 divisors, whose sum is σ = 155866120908960. Its totient is φ = 155866120908958.

The previous prime is 155866120908923. The next prime is 155866120909033. The reversal of 155866120908959 is 959809021668551.

It is an a-pointer prime, because the next prime (155866120909033) can be obtained adding 155866120908959 to its sum of digits (74).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155866120908959 - 2⁸ = 155866120908703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155866120908059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77933060454479 + 77933060454480.

It is an arithmetic number, because the mean of its divisors is an integer number (77933060454480).

Almost surely, 2^{155866120908959} is an apocalyptic number.

155866120908959 is a deficient number, since it is larger than the sum of its proper divisors (1).

155866120908959 is an equidigital number, since it uses as much as digits as its factorization.

155866120908959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904000, while the sum is 74.

The spelling of 155866120908959 in words is "one hundred fifty-five trillion, eight hundred sixty-six billion, one hundred twenty million, nine hundred eight thousand, nine hundred fifty-nine".