155449901220101 has 4 divisors (see below), whose sum is σ = 155449983580332. Its totient is φ = 155449818859872.

The previous prime is 155449901220091. The next prime is 155449901220121. The reversal of 155449901220101 is 101022109944551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72196120048900 + 83253781171201 = 8496830^2 + 9124351^2 .

It is a cyclic number.

It is not a de Polignac number, because 155449901220101 - 2³⁰ = 155448827478277 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 (155449901220121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38280920 + ... + 42146513.

It is an arithmetic number, because the mean of its divisors is an integer number (38862495895083).

Almost surely, 2^{155449901220101} is an apocalyptic number.

It is an amenable number.

155449901220101 is a deficient number, since it is larger than the sum of its proper divisors (82360231).

155449901220101 is an equidigital number, since it uses as much as digits as its factorization.

155449901220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82360230.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 155449901220101 in words is "one hundred fifty-five trillion, four hundred forty-nine billion, nine hundred one million, two hundred twenty thousand, one hundred one".