71666628988 has 6 divisors (see below), whose sum is σ = 125416600736. Its totient is φ = 35833314492.

The previous prime is 71666628967. The next prime is 71666629049. The reversal of 71666628988 is 88982666617.

It is a super-2 number, since 2×71666628988² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8958328620 + ... + 8958328627.

Almost surely, 2^71666628988 is an apocalyptic number.

It is an amenable number.

71666628988 is a deficient number, since it is larger than the sum of its proper divisors (53749971748).

71666628988 is a wasteful number, since it uses less digits than its factorization.

71666628988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17916657251 (or 17916657249 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 67.

The spelling of 71666628988 in words is "seventy-one billion, six hundred sixty-six million, six hundred twenty-eight thousand, nine hundred eighty-eight".