86661939393 has 8 divisors (see below), whose sum is σ = 128388058400. Its totient is φ = 57774626244.

The previous prime is 86661939379. The next prime is 86661939409. The reversal of 86661939393 is 39393916668.

It is not a de Polignac number, because 86661939393 - 2⁸ = 86661939137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 86661939393.

It is not an unprimeable number, because it can be changed into a prime (86661739393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1604850703 + ... + 1604850756.

It is an arithmetic number, because the mean of its divisors is an integer number (16048507300).

Almost surely, 2^86661939393 is an apocalyptic number.

It is an amenable number.

86661939393 is a deficient number, since it is larger than the sum of its proper divisors (41726119007).

86661939393 is a wasteful number, since it uses less digits than its factorization.

86661939393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3209701468 (or 3209701462 counting only the distinct ones).

The product of its digits is 34012224, while the sum is 63.

Adding to 86661939393 its sum of digits (63), we get a square (86661939456 = 294384²).

The spelling of 86661939393 in words is "eighty-six billion, six hundred sixty-one million, nine hundred thirty-nine thousand, three hundred ninety-three".