155521220115 has 16 divisors (see below), whose sum is σ = 248840748288. Its totient is φ = 82942385376.

The previous prime is 155521220093. The next prime is 155521220119. The reversal of 155521220115 is 511022125551.

155521220115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155521220115 - 2⁹ = 155521219603 is a prime.

It is a super-2 number, since 2×155521220115² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155521220119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528124 + ... + 768086.

It is an arithmetic number, because the mean of its divisors is an integer number (15552546768).

Almost surely, 2^155521220115 is an apocalyptic number.

155521220115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155521220115 is a deficient number, since it is larger than the sum of its proper divisors (93319528173).

155521220115 is a wasteful number, since it uses less digits than its factorization.

155521220115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283178.

The product of its (nonzero) digits is 5000, while the sum is 30.

Adding to 155521220115 its reverse (511022125551), we get a palindrome (666543345666).

The spelling of 155521220115 in words is "one hundred fifty-five billion, five hundred twenty-one million, two hundred twenty thousand, one hundred fifteen".