155109945649 has 2 divisors, whose sum is σ = 155109945650. Its totient is φ = 155109945648.

The previous prime is 155109945629. The next prime is 155109945659. The reversal of 155109945649 is 946549901551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155109945600 + 49 = 393840^2 + 7^2 .

It is a cyclic number.

It is not a de Polignac number, because 155109945649 - 2¹⁷ = 155109814577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155109945593 and 155109945602.

It is not a weakly prime, because it can be changed into another prime (155109945629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77554972824 + 77554972825.

It is an arithmetic number, because the mean of its divisors is an integer number (77554972825).

Almost surely, 2^155109945649 is an apocalyptic number.

It is an amenable number.

155109945649 is a deficient number, since it is larger than the sum of its proper divisors (1).

155109945649 is an equidigital number, since it uses as much as digits as its factorization.

155109945649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748000, while the sum is 58.

It can be divided in two parts, 1551099456 and 49, that multiplied together give a square (76003873344 = 275688²).

The spelling of 155109945649 in words is "one hundred fifty-five billion, one hundred nine million, nine hundred forty-five thousand, six hundred forty-nine".