155253312432161 has 2 divisors, whose sum is σ = 155253312432162. Its totient is φ = 155253312432160.

The previous prime is 155253312432107. The next prime is 155253312432263. The reversal of 155253312432161 is 161234213352551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81300536255761 + 73952776176400 = 9016681^2 + 8599580^2 .

It is an emirp because it is prime and its reverse (161234213352551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155253312432161 - 2¹⁸ = 155253312170017 is a prime.

It is not a weakly prime, because it can be changed into another prime (155253312432761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77626656216080 + 77626656216081.

It is an arithmetic number, because the mean of its divisors is an integer number (77626656216081).

Almost surely, 2^{155253312432161} is an apocalyptic number.

It is an amenable number.

155253312432161 is a deficient number, since it is larger than the sum of its proper divisors (1).

155253312432161 is an equidigital number, since it uses as much as digits as its factorization.

155253312432161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 44.

The spelling of 155253312432161 in words is "one hundred fifty-five trillion, two hundred fifty-three billion, three hundred twelve million, four hundred thirty-two thousand, one hundred sixty-one".