71660660719 has 4 divisors (see below), whose sum is σ = 71681333544. Its totient is φ = 71639987896.

The previous prime is 71660660651. The next prime is 71660660783. The reversal of 71660660719 is 91706606617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91706606617 = 3083 ⋅29745899.

It is a cyclic number.

It is not a de Polignac number, because 71660660719 - 2¹³ = 71660652527 is a prime.

It is a super-2 number, since 2×71660660719² (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 (71660660219) 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, 10331212 + ... + 10338145.

It is an arithmetic number, because the mean of its divisors is an integer number (17920333386).

Almost surely, 2^71660660719 is an apocalyptic number.

71660660719 is a deficient number, since it is larger than the sum of its proper divisors (20672825).

71660660719 is a wasteful number, since it uses less digits than its factorization.

71660660719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20672824.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 71660660719 in words is "seventy-one billion, six hundred sixty million, six hundred sixty thousand, seven hundred nineteen".