71561800278042 has 16 divisors (see below), whose sum is σ = 143124276448992. Its totient is φ = 23853820777200.

The previous prime is 71561800278041. The next prime is 71561800278167. The reversal of 71561800278042 is 24087200816517.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (71561800278041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26780584 + ... + 29331267.

It is an arithmetic number, because the mean of its divisors is an integer number (8945267278062).

Almost surely, 2^{71561800278042} is an apocalyptic number.

71561800278042 is an abundant number, since it is smaller than the sum of its proper divisors (71562476170950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71561800278042 is a wasteful number, since it uses less digits than its factorization.

71561800278042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56324413.

The product of its (nonzero) digits is 1505280, while the sum is 51.

The spelling of 71561800278042 in words is "seventy-one trillion, five hundred sixty-one billion, eight hundred million, two hundred seventy-eight thousand, forty-two".