1215405242255 has 64 divisors (see below), whose sum is σ = 1669205180160. Its totient is φ = 844032516096.

The previous prime is 1215405242237. The next prime is 1215405242263. The reversal of 1215405242255 is 5522425045121.

It is a cyclic number.

It is not a de Polignac number, because 1215405242255 - 2³⁸ = 940527335311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43811369 + ... + 43839101.

It is an arithmetic number, because the mean of its divisors is an integer number (26081330940).

Almost surely, 2^{1215405242255} is an apocalyptic number.

1215405242255 is a deficient number, since it is larger than the sum of its proper divisors (453799937905).

1215405242255 is a wasteful number, since it uses less digits than its factorization.

1215405242255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28580.

The product of its (nonzero) digits is 160000, while the sum is 38.

The spelling of 1215405242255 in words is "one trillion, two hundred fifteen billion, four hundred five million, two hundred forty-two thousand, two hundred fifty-five".