1215554041555 has 64 divisors (see below), whose sum is σ = 1774068645888. Its totient is φ = 780516864000.

The previous prime is 1215554041523. The next prime is 1215554041561. The reversal of 1215554041555 is 5551404555121.

It is not a de Polignac number, because 1215554041555 - 2⁵ = 1215554041523 is a prime.

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, 135042055 + ... + 135051055.

It is an arithmetic number, because the mean of its divisors is an integer number (27719822592).

Almost surely, 2^{1215554041555} is an apocalyptic number.

1215554041555 is a deficient number, since it is larger than the sum of its proper divisors (558514604333).

1215554041555 is a wasteful number, since it uses less digits than its factorization.

1215554041555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10156.

The product of its (nonzero) digits is 500000, while the sum is 43.

Adding to 1215554041555 its reverse (5551404555121), we get a palindrome (6766958596676).

The spelling of 1215554041555 in words is "one trillion, two hundred fifteen billion, five hundred fifty-four million, forty-one thousand, five hundred fifty-five".