155109945691 has 2 divisors, whose sum is σ = 155109945692. Its totient is φ = 155109945690.

The previous prime is 155109945659. The next prime is 155109945713. The reversal of 155109945691 is 196549901551.

155109945691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155109945691 - 2⁵ = 155109945659 is a prime.

It is not a weakly prime, because it can be changed into another prime (155109985691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77554972845 + 77554972846.

It is an arithmetic number, because the mean of its divisors is an integer number (77554972846).

Almost surely, 2^155109945691 is an apocalyptic number.

155109945691 is a deficient number, since it is larger than the sum of its proper divisors (1).

155109945691 is an equidigital number, since it uses as much as digits as its factorization.

155109945691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187000, while the sum is 55.

The spelling of 155109945691 in words is "one hundred fifty-five billion, one hundred nine million, nine hundred forty-five thousand, six hundred ninety-one".