71649809524 has 12 divisors (see below), whose sum is σ = 125541780448. Its totient is φ = 35780729400.

The previous prime is 71649809513. The next prime is 71649809531. The reversal of 71649809524 is 42590894617.

It is a super-2 number, since 2×71649809524² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11040192 + ... + 11046679.

Almost surely, 2^71649809524 is an apocalyptic number.

It is an amenable number.

71649809524 is a deficient number, since it is larger than the sum of its proper divisors (53891970924).

71649809524 is a wasteful number, since it uses less digits than its factorization.

71649809524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22087686 (or 22087684 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 71649809524 in words is "seventy-one billion, six hundred forty-nine million, eight hundred nine thousand, five hundred twenty-four".