71666678776 has 64 divisors (see below), whose sum is σ = 167563630080. Its totient is φ = 27916894080.

The previous prime is 71666678761. The next prime is 71666678801. The reversal of 71666678776 is 67787666617.

It is a super-2 number, since 2×71666678776² (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 in 15 ways as a sum of consecutive naturals, for example, 6211525 + ... + 6223051.

It is an arithmetic number, because the mean of its divisors is an integer number (2618181720).

Almost surely, 2^71666678776 is an apocalyptic number.

It is an amenable number.

71666678776 is an abundant number, since it is smaller than the sum of its proper divisors (95896951304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71666678776 is a wasteful number, since it uses less digits than its factorization.

71666678776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21644 (or 21640 counting only the distinct ones).

The product of its digits is 149361408, while the sum is 67.

The spelling of 71666678776 in words is "seventy-one billion, six hundred sixty-six million, six hundred seventy-eight thousand, seven hundred seventy-six".