78558085280555 has 4 divisors (see below), whose sum is σ = 94269702336672. Its totient is φ = 62846468224440.

The previous prime is 78558085280509. The next prime is 78558085280569. The reversal of 78558085280555 is 55508258085587.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78558085280555 - 2¹⁶ = 78558085215019 is a prime.

It is a super-2 number, since 2×78558085280555² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7855808528051 + ... + 7855808528060.

It is an arithmetic number, because the mean of its divisors is an integer number (23567425584168).

Almost surely, 2^{78558085280555} is an apocalyptic number.

78558085280555 is a deficient number, since it is larger than the sum of its proper divisors (15711617056117).

78558085280555 is a wasteful number, since it uses less digits than its factorization.

78558085280555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15711617056116.

The product of its (nonzero) digits is 896000000, while the sum is 71.

The spelling of 78558085280555 in words is "seventy-eight trillion, five hundred fifty-eight billion, eighty-five million, two hundred eighty thousand, five hundred fifty-five".