1215555500255 has 16 divisors (see below), whose sum is σ = 1463150732160. Its totient is φ = 969455596032.

The previous prime is 1215555500251. The next prime is 1215555500279. The reversal of 1215555500255 is 5520055555121.

It is a cyclic number.

It is not a de Polignac number, because 1215555500255 - 2² = 1215555500251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215555500251) 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, 18429626 + ... + 18495464.

It is an arithmetic number, because the mean of its divisors is an integer number (91446920760).

Almost surely, 2^{1215555500255} is an apocalyptic number.

1215555500255 is a deficient number, since it is larger than the sum of its proper divisors (247595231905).

1215555500255 is a wasteful number, since it uses less digits than its factorization.

1215555500255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77138.

The product of its (nonzero) digits is 312500, while the sum is 41.

The spelling of 1215555500255 in words is "one trillion, two hundred fifteen billion, five hundred fifty-five million, five hundred thousand, two hundred fifty-five".