71561800278060 has 144 divisors (see below), whose sum is σ = 209488048745472. Its totient is φ = 18233791804800.

The previous prime is 71561800278041. The next prime is 71561800278167. The reversal of 71561800278060 is 6087200816517.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 71561800277994 and 71561800278012.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8525895 + ... + 14690625.

It is an arithmetic number, because the mean of its divisors is an integer number (1454778116288).

Almost surely, 2^{71561800278060} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71561800278060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104744024372736).

71561800278060 is an abundant number, since it is smaller than the sum of its proper divisors (137926248467412).

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

71561800278060 is a wasteful number, since it uses less digits than its factorization.

71561800278060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6164932 (or 6164851 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 71561800278060 in words is "seventy-one trillion, five hundred sixty-one billion, eight hundred million, two hundred seventy-eight thousand, sixty".