155321546242217 has 2 divisors, whose sum is σ = 155321546242218. Its totient is φ = 155321546242216.

The previous prime is 155321546242199. The next prime is 155321546242283. The reversal of 155321546242217 is 712242645123551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155225285595136 + 96260647081 = 12458944^2 + 310259^2 .

It is a cyclic number.

It is not a de Polignac number, because 155321546242217 - 2¹⁶ = 155321546176681 is a prime.

It is not a weakly prime, because it can be changed into another prime (155321546244217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77660773121108 + 77660773121109.

It is an arithmetic number, because the mean of its divisors is an integer number (77660773121109).

Almost surely, 2^{155321546242217} is an apocalyptic number.

It is an amenable number.

155321546242217 is a deficient number, since it is larger than the sum of its proper divisors (1).

155321546242217 is an equidigital number, since it uses as much as digits as its factorization.

155321546242217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032000, while the sum is 50.

The spelling of 155321546242217 in words is "one hundred fifty-five trillion, three hundred twenty-one billion, five hundred forty-six million, two hundred forty-two thousand, two hundred seventeen".