71561780057113 has 16 divisors (see below), whose sum is σ = 72924656694912. Its totient is φ = 70211988000000.

The previous prime is 71561780056973. The next prime is 71561780057123. The reversal of 71561780057113 is 31175008716517.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 71561780057113 - 2²⁹ = 71561243186201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71561780057123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55872538 + ... + 57138988.

It is an arithmetic number, because the mean of its divisors is an integer number (4557791043432).

Almost surely, 2^{71561780057113} is an apocalyptic number.

It is an amenable number.

71561780057113 is a deficient number, since it is larger than the sum of its proper divisors (1362876637799).

71561780057113 is a wasteful number, since it uses less digits than its factorization.

71561780057113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271616.

The product of its (nonzero) digits is 1234800, while the sum is 52.

The spelling of 71561780057113 in words is "seventy-one trillion, five hundred sixty-one billion, seven hundred eighty million, fifty-seven thousand, one hundred thirteen".