155503232161 has 2 divisors, whose sum is σ = 155503232162. Its totient is φ = 155503232160.

The previous prime is 155503232147. The next prime is 155503232189. The reversal of 155503232161 is 161232305551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142744174225 + 12759057936 = 377815^2 + 112956^2 .

It is a cyclic number.

It is not a de Polignac number, because 155503232161 - 2¹⁵ = 155503199393 is a prime.

It is not a weakly prime, because it can be changed into another prime (155503233161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77751616080 + 77751616081.

It is an arithmetic number, because the mean of its divisors is an integer number (77751616081).

Almost surely, 2^155503232161 is an apocalyptic number.

It is an amenable number.

155503232161 is a deficient number, since it is larger than the sum of its proper divisors (1).

155503232161 is an equidigital number, since it uses as much as digits as its factorization.

155503232161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 155503232161 in words is "one hundred fifty-five billion, five hundred three million, two hundred thirty-two thousand, one hundred sixty-one".