71786618397 has 12 divisors (see below), whose sum is σ = 111668073244. Its totient is φ = 44176380480.

The previous prime is 71786618389. The next prime is 71786618399. The reversal of 71786618397 is 79381668717.

71786618397 is a `hidden beast` number, since 7 + 1 + 7 + 8 + 6 + 618 + 3 + 9 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8196405156 + 63590213241 = 90534^2 + 252171^2 .

It is not a de Polignac number, because 71786618397 - 2³ = 71786618389 is a prime.

It is a super-3 number, since 3×71786618397³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71786618399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306780304 + ... + 306780537.

Almost surely, 2^71786618397 is an apocalyptic number.

It is an amenable number.

71786618397 is a deficient number, since it is larger than the sum of its proper divisors (39881454847).

71786618397 is a wasteful number, since it uses less digits than its factorization.

71786618397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613560860 (or 613560857 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 71786618397 in words is "seventy-one billion, seven hundred eighty-six million, six hundred eighteen thousand, three hundred ninety-seven".