71666607156 has 12 divisors (see below), whose sum is σ = 167222083392. Its totient is φ = 23888869048.

The previous prime is 71666607149. The next prime is 71666607157. The reversal of 71666607156 is 65170666617.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×71666607156³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 71666607099 and 71666607108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71666607157) by changing a digit.

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, 2986108620 + ... + 2986108643.

It is an arithmetic number, because the mean of its divisors is an integer number (13935173616).

Almost surely, 2^71666607156 is an apocalyptic number.

It is an amenable number.

71666607156 is an abundant number, since it is smaller than the sum of its proper divisors (95555476236).

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

71666607156 is a wasteful number, since it uses less digits than its factorization.

71666607156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5972217270 (or 5972217268 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 71666607156 in words is "seventy-one billion, six hundred sixty-six million, six hundred seven thousand, one hundred fifty-six".