155065600505993 has 2 divisors, whose sum is σ = 155065600505994. Its totient is φ = 155065600505992.

The previous prime is 155065600505899. The next prime is 155065600506097. The reversal of 155065600505993 is 399505006560551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107305503992569 + 47760096513424 = 10358837^2 + 6910868^2 .

It is a cyclic number.

It is not a de Polignac number, because 155065600505993 - 2¹² = 155065600501897 is a prime.

It is not a weakly prime, because it can be changed into another prime (155065600505393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77532800252996 + 77532800252997.

It is an arithmetic number, because the mean of its divisors is an integer number (77532800252997).

Almost surely, 2^{155065600505993} is an apocalyptic number.

It is an amenable number.

155065600505993 is a deficient number, since it is larger than the sum of its proper divisors (1).

155065600505993 is an equidigital number, since it uses as much as digits as its factorization.

155065600505993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27337500, while the sum is 59.

The spelling of 155065600505993 in words is "one hundred fifty-five trillion, sixty-five billion, six hundred million, five hundred five thousand, nine hundred ninety-three".