15515555055 has 64 divisors (see below), whose sum is σ = 33331350528. Its totient is φ = 5952015360.

The previous prime is 15515555051. The next prime is 15515555113. The reversal of 15515555055 is 55055551551.

It is not a de Polignac number, because 15515555055 - 2² = 15515555051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15515554998 and 15515555016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15515555051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 501654 + ... + 531683.

It is an arithmetic number, because the mean of its divisors is an integer number (520802352).

Almost surely, 2^15515555055 is an apocalyptic number.

15515555055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15515555055 is an abundant number, since it is smaller than the sum of its proper divisors (17815795473).

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

15515555055 is a wasteful number, since it uses less digits than its factorization.

15515555055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033376.

The product of its (nonzero) digits is 390625, while the sum is 42.

The spelling of 15515555055 in words is "fifteen billion, five hundred fifteen million, five hundred fifty-five thousand, fifty-five".