71663842609 has 4 divisors (see below), whose sum is σ = 71665473600. Its totient is φ = 71662211620.

The previous prime is 71663842583. The next prime is 71663842633. The reversal of 71663842609 is 90624836617.

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 71663842609 - 2²⁹ = 71126971697 is a prime.

It is a super-3 number, since 3×71663842609³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71663842909) 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, 747709 + ... + 838090.

It is an arithmetic number, because the mean of its divisors is an integer number (17916368400).

Almost surely, 2^71663842609 is an apocalyptic number.

It is an amenable number.

71663842609 is a deficient number, since it is larger than the sum of its proper divisors (1630991).

71663842609 is a wasteful number, since it uses less digits than its factorization.

71663842609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630990.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 71663842609 in words is "seventy-one billion, six hundred sixty-three million, eight hundred forty-two thousand, six hundred nine".