15575779055 has 16 divisors (see below), whose sum is σ = 20530091520. Its totient is φ = 11291547168.

The previous prime is 15575779039. The next prime is 15575779057. The reversal of 15575779055 is 55097757551.

It is a cyclic number.

It is not a de Polignac number, because 15575779055 - 2⁴ = 15575779039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15575779057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3562067 + ... + 3566436.

It is an arithmetic number, because the mean of its divisors is an integer number (1283130720).

Almost surely, 2^15575779055 is an apocalyptic number.

15575779055 is a deficient number, since it is larger than the sum of its proper divisors (4954312465).

15575779055 is a wasteful number, since it uses less digits than its factorization.

15575779055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7128550.

The product of its (nonzero) digits is 9646875, while the sum is 56.

The spelling of 15575779055 in words is "fifteen billion, five hundred seventy-five million, seven hundred seventy-nine thousand, fifty-five".