71666716667 has 32 divisors (see below), whose sum is σ = 89749416960. Its totient is φ = 55711681920.

The previous prime is 71666716657. The next prime is 71666716711. The reversal of 71666716667 is 76661766617.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 71666716667 - 2¹⁰ = 71666715643 is a prime.

It is a super-2 number, since 2×71666716667² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is not an unprimeable number, because it can be changed into a prime (71666716657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18322442 + ... + 18326352.

It is an arithmetic number, because the mean of its divisors is an integer number (2804669280).

Almost surely, 2^71666716667 is an apocalyptic number.

71666716667 is a deficient number, since it is larger than the sum of its proper divisors (18082700293).

71666716667 is a wasteful number, since it uses less digits than its factorization.

71666716667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7403.

The product of its digits is 16003008, while the sum is 59.

The spelling of 71666716667 in words is "seventy-one billion, six hundred sixty-six million, seven hundred sixteen thousand, six hundred sixty-seven".