71666751438 has 48 divisors (see below), whose sum is σ = 156470713776. Its totient is φ = 23705550720.

The previous prime is 71666751413. The next prime is 71666751493. The reversal of 71666751438 is 83415766617.

It is a super-2 number, since 2×71666751438² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10755828 + ... + 10762488.

It is an arithmetic number, because the mean of its divisors is an integer number (3259806537).

Almost surely, 2^71666751438 is an apocalyptic number.

71666751438 is an abundant number, since it is smaller than the sum of its proper divisors (84803962338).

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

71666751438 is a wasteful number, since it uses less digits than its factorization.

71666751438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11169 (or 11166 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 71666751438 in words is "seventy-one billion, six hundred sixty-six million, seven hundred fifty-one thousand, four hundred thirty-eight".