71660659 has 4 divisors (see below), whose sum is σ = 81897904. Its totient is φ = 61423416.

The previous prime is 71660657. The next prime is 71660671. The reversal of 71660659 is 95606617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95606617 = 677 ⋅141221.

It is a cyclic number.

It is not a de Polignac number, because 71660659 - 2¹ = 71660657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71660651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5118612 + ... + 5118625.

It is an arithmetic number, because the mean of its divisors is an integer number (20474476).

Almost surely, 2^71660659 is an apocalyptic number.

71660659 is a deficient number, since it is larger than the sum of its proper divisors (10237245).

71660659 is a wasteful number, since it uses less digits than its factorization.

71660659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10237244.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 71660659 is about 8465.2618978978. The cubic root of 71660659 is about 415.3621631695.

The spelling of 71660659 in words is "seventy-one million, six hundred sixty thousand, six hundred fifty-nine".