15555055050109 has 2 divisors, whose sum is σ = 15555055050110. Its totient is φ = 15555055050108.

The previous prime is 15555055050047. The next prime is 15555055050151. The reversal of 15555055050109 is 90105055055551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12256755931225 + 3298299118884 = 3500965^2 + 1816122^2 .

It is a cyclic number.

It is not a de Polignac number, because 15555055050109 - 2³⁵ = 15520695311741 is a prime.

It is a super-2 number, since 2×15555055050109² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15555055057109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7777527525054 + 7777527525055.

It is an arithmetic number, because the mean of its divisors is an integer number (7777527525055).

Almost surely, 2^{15555055050109} is an apocalyptic number.

It is an amenable number.

15555055050109 is a deficient number, since it is larger than the sum of its proper divisors (1).

15555055050109 is an equidigital number, since it uses as much as digits as its factorization.

15555055050109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 703125, while the sum is 46.

The spelling of 15555055050109 in words is "fifteen trillion, five hundred fifty-five billion, fifty-five million, fifty thousand, one hundred nine".