15505550055 has 24 divisors (see below), whose sum is σ = 26973334752. Its totient is φ = 8239765824.

The previous prime is 15505550051. The next prime is 15505550083. The reversal of 15505550055 is 55005550551.

It is a happy number.

15505550055 is a `hidden beast` number, since 1 + 5 + 50 + 5 + 550 + 0 + 55 = 666.

It is not a de Polignac number, because 15505550055 - 2² = 15505550051 is a prime.

It is a super-2 number, since 2×15505550055² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15505550051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 609499 + ... + 634428.

It is an arithmetic number, because the mean of its divisors is an integer number (1123888948).

Almost surely, 2^15505550055 is an apocalyptic number.

15505550055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15505550055 is a deficient number, since it is larger than the sum of its proper divisors (11467784697).

15505550055 is a wasteful number, since it uses less digits than its factorization.

15505550055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244215 (or 1244212 counting only the distinct ones).

The product of its (nonzero) digits is 78125, while the sum is 36.

The spelling of 15505550055 in words is "fifteen billion, five hundred five million, five hundred fifty thousand, fifty-five".