155221152054128 has 30 divisors (see below), whose sum is σ = 319472254356216. Its totient is φ = 73045248023296.

The previous prime is 155221152054127. The next prime is 155221152054139. The reversal of 155221152054128 is 821450251122551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155221152054127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16784289500 + ... + 16784298747.

Almost surely, 2^{155221152054128} is an apocalyptic number.

It is an amenable number.

155221152054128 is an abundant number, since it is smaller than the sum of its proper divisors (164251102302088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155221152054128 is a wasteful number, since it uses less digits than its factorization.

155221152054128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33568588289 (or 33568588266 counting only the distinct ones).

The product of its (nonzero) digits is 320000, while the sum is 44.

The spelling of 155221152054128 in words is "one hundred fifty-five trillion, two hundred twenty-one billion, one hundred fifty-two million, fifty-four thousand, one hundred twenty-eight".