155501557020771 has 16 divisors (see below), whose sum is σ = 223309017190560. Its totient is φ = 95682667207680.

The previous prime is 155501557020751. The next prime is 155501557020793. The reversal of 155501557020771 is 177020755105551.

It is not a de Polignac number, because 155501557020771 - 2⁶ = 155501557020707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155501557020721) 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 15 ways as a sum of consecutive naturals, for example, 220448590 + ... + 221152851.

It is an arithmetic number, because the mean of its divisors is an integer number (13956813574410).

Almost surely, 2^{155501557020771} is an apocalyptic number.

155501557020771 is a deficient number, since it is larger than the sum of its proper divisors (67807460169789).

155501557020771 is a wasteful number, since it uses less digits than its factorization.

155501557020771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441610486.

The product of its (nonzero) digits is 2143750, while the sum is 51.

The spelling of 155501557020771 in words is "one hundred fifty-five trillion, five hundred one billion, five hundred fifty-seven million, twenty thousand, seven hundred seventy-one".