71561416517 has 4 divisors (see below), whose sum is σ = 75327806880. Its totient is φ = 67795026156.

The previous prime is 71561416501. The next prime is 71561416541.

71561416517 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71561416517 - 2⁴ = 71561416501 is a prime.

It is a super-2 number, since 2×71561416517² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71561418517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1883195153 + ... + 1883195190.

It is an arithmetic number, because the mean of its divisors is an integer number (18831951720).

Almost surely, 2^71561416517 is an apocalyptic number.

It is an amenable number.

71561416517 is a deficient number, since it is larger than the sum of its proper divisors (3766390363).

71561416517 is a wasteful number, since it uses less digits than its factorization.

71561416517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766390362.

The product of its digits is 176400, while the sum is 44.

The spelling of 71561416517 in words is "seventy-one billion, five hundred sixty-one million, four hundred sixteen thousand, five hundred seventeen".