155151221552449 has 2 divisors, whose sum is σ = 155151221552450. Its totient is φ = 155151221552448.

The previous prime is 155151221552363. The next prime is 155151221552501. The reversal of 155151221552449 is 944255122151551.

It is an a-pointer prime, because the next prime (155151221552501) can be obtained adding 155151221552449 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., 114297801730225 + 40853419822224 = 10691015^2 + 6391668^2 .

It is a cyclic number.

It is not a de Polignac number, because 155151221552449 - 2³¹ = 155149074068801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155151221552396 and 155151221552405.

It is not a weakly prime, because it can be changed into another prime (155151221552749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77575610776224 + 77575610776225.

It is an arithmetic number, because the mean of its divisors is an integer number (77575610776225).

Almost surely, 2^{155151221552449} is an apocalyptic number.

It is an amenable number.

155151221552449 is a deficient number, since it is larger than the sum of its proper divisors (1).

155151221552449 is an equidigital number, since it uses as much as digits as its factorization.

155151221552449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600000, while the sum is 52.

The spelling of 155151221552449 in words is "one hundred fifty-five trillion, one hundred fifty-one billion, two hundred twenty-one million, five hundred fifty-two thousand, four hundred forty-nine".