71661489692 has 24 divisors (see below), whose sum is σ = 138348358512. Its totient is φ = 32267836800.

The previous prime is 71661489649. The next prime is 71661489721. The reversal of 71661489692 is 29698416617.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16804034 + ... + 16808297.

It is an arithmetic number, because the mean of its divisors is an integer number (5764514938).

Almost surely, 2^71661489692 is an apocalyptic number.

It is an amenable number.

71661489692 is a deficient number, since it is larger than the sum of its proper divisors (66686868820).

71661489692 is a wasteful number, since it uses less digits than its factorization.

71661489692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33612389 (or 33612387 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 59.

The spelling of 71661489692 in words is "seventy-one billion, six hundred sixty-one million, four hundred eighty-nine thousand, six hundred ninety-two".