155109945601 has 24 divisors (see below), whose sum is σ = 168657082200. Its totient is φ = 142584938496.

The previous prime is 155109945581. The next prime is 155109945629. The reversal of 155109945601 is 106549901551.

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

It can be written as a sum of positive squares in 12 ways, for example, as 76906382400 + 78203563201 = 277320^2 + 279649^2 .

It is not a de Polignac number, because 155109945601 - 2²³ = 155101556993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155109945691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46816921 + ... + 46820233.

It is an arithmetic number, because the mean of its divisors is an integer number (7027378425).

Almost surely, 2^155109945601 is an apocalyptic number.

It is an amenable number.

155109945601 is a deficient number, since it is larger than the sum of its proper divisors (13547136599).

155109945601 is a wasteful number, since it uses less digits than its factorization.

155109945601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405 (or 4392 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 46.

The spelling of 155109945601 in words is "one hundred fifty-five billion, one hundred nine million, nine hundred forty-five thousand, six hundred one".