155768860217 has 2 divisors, whose sum is σ = 155768860218. Its totient is φ = 155768860216.

The previous prime is 155768860183. The next prime is 155768860229. The reversal of 155768860217 is 712068867551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144716333056 + 11052527161 = 380416^2 + 105131^2 .

It is a cyclic number.

It is not a de Polignac number, because 155768860217 - 2⁶ = 155768860153 is a prime.

It is not a weakly prime, because it can be changed into another prime (155768860237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77884430108 + 77884430109.

It is an arithmetic number, because the mean of its divisors is an integer number (77884430109).

Almost surely, 2^155768860217 is an apocalyptic number.

It is an amenable number.

155768860217 is a deficient number, since it is larger than the sum of its proper divisors (1).

155768860217 is an equidigital number, since it uses as much as digits as its factorization.

155768860217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5644800, while the sum is 56.

The spelling of 155768860217 in words is "one hundred fifty-five billion, seven hundred sixty-eight million, eight hundred sixty thousand, two hundred seventeen".