71561800278061 has 8 divisors (see below), whose sum is σ = 71740173574080. Its totient is φ = 71383615043328.

The previous prime is 71561800278041. The next prime is 71561800278167. The reversal of 71561800278061 is 16087200816517.

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 71561800278061 - 2¹¹ = 71561800276013 is a prime.

It is a Duffinian number.

It is a congruent 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, 46253311 + ... + 47775436.

It is an arithmetic number, because the mean of its divisors is an integer number (8967521696760).

Almost surely, 2^{71561800278061} is an apocalyptic number.

It is an amenable number.

71561800278061 is a deficient number, since it is larger than the sum of its proper divisors (178373296019).

71561800278061 is a wasteful number, since it uses less digits than its factorization.

71561800278061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94030643.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 71561800278061 in words is "seventy-one trillion, five hundred sixty-one billion, eight hundred million, two hundred seventy-eight thousand, sixty-one".