71561778111255 has 16 divisors (see below), whose sum is σ = 117593408356704. Its totient is φ = 37134760533120.

The previous prime is 71561778111137. The next prime is 71561778111283. The reversal of 71561778111255 is 55211187716517.

It is a happy number.

It is not a de Polignac number, because 71561778111255 - 2⁹ = 71561778110743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71561778111195 and 71561778111204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64470069816 + ... + 64470070925.

It is an arithmetic number, because the mean of its divisors is an integer number (7349588022294).

Almost surely, 2^{71561778111255} is an apocalyptic number.

71561778111255 is a deficient number, since it is larger than the sum of its proper divisors (46031630245449).

71561778111255 is a wasteful number, since it uses less digits than its factorization.

71561778111255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128940140786.

The product of its digits is 4116000, while the sum is 57.

The spelling of 71561778111255 in words is "seventy-one trillion, five hundred sixty-one billion, seven hundred seventy-eight million, one hundred eleven thousand, two hundred fifty-five".