155444510242069 has 2 divisors, whose sum is σ = 155444510242070. Its totient is φ = 155444510242068.

The previous prime is 155444510241991. The next prime is 155444510242121. The reversal of 155444510242069 is 960242015444551.

It is an a-pointer prime, because the next prime (155444510242121) can be obtained adding 155444510242069 to its sum of digits (52).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118992645140625 + 36451865101444 = 10908375^2 + 6037538^2 .

It is a cyclic number.

It is not a de Polignac number, because 155444510242069 - 2¹¹ = 155444510240021 is a prime.

It is a super-2 number, since 2×155444510242069² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155444510252069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77722255121034 + 77722255121035.

It is an arithmetic number, because the mean of its divisors is an integer number (77722255121035).

Almost surely, 2^{155444510242069} is an apocalyptic number.

It is an amenable number.

155444510242069 is a deficient number, since it is larger than the sum of its proper divisors (1).

155444510242069 is an equidigital number, since it uses as much as digits as its factorization.

155444510242069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912000, while the sum is 52.

The spelling of 155444510242069 in words is "one hundred fifty-five trillion, four hundred forty-four billion, five hundred ten million, two hundred forty-two thousand, sixty-nine".