2561558158855 has 8 divisors (see below), whose sum is σ = 3074587507152. Its totient is φ = 2048768049408.

The previous prime is 2561558158837. The next prime is 2561558158903. The reversal of 2561558158855 is 5588518551652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2561558158855 - 2⁵ = 2561558158823 is a prime.

It is a super-2 number, since 2×2561558158855² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59786154 + ... + 59828983.

It is an arithmetic number, because the mean of its divisors is an integer number (384323438394).

Almost surely, 2^{2561558158855} is an apocalyptic number.

2561558158855 is a deficient number, since it is larger than the sum of its proper divisors (513029348297).

2561558158855 is a wasteful number, since it uses less digits than its factorization.

2561558158855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119619425.

The product of its digits is 96000000, while the sum is 64.

The spelling of 2561558158855 in words is "two trillion, five hundred sixty-one billion, five hundred fifty-eight million, one hundred fifty-eight thousand, eight hundred fifty-five".