155109945599 has 16 divisors (see below), whose sum is σ = 187707506688. Its totient is φ = 125123087232.

The previous prime is 155109945581. The next prime is 155109945629. The reversal of 155109945599 is 995549901551.

It is a Cunningham number, because it is equal to 393840²-1.

It is a cyclic number.

It is not a de Polignac number, because 155109945599 - 2²⁴ = 155093168383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155109945559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2728742 + ... + 2785004.

It is an arithmetic number, because the mean of its divisors is an integer number (11731719168).

Almost surely, 2^155109945599 is an apocalyptic number.

155109945599 is a deficient number, since it is larger than the sum of its proper divisors (32597561089).

155109945599 is a wasteful number, since it uses less digits than its factorization.

155109945599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79454.

The product of its (nonzero) digits is 16402500, while the sum is 62.

The spelling of 155109945599 in words is "one hundred fifty-five billion, one hundred nine million, nine hundred forty-five thousand, five hundred ninety-nine".