83943566397 has 6 divisors (see below), whose sum is σ = 121251818142. Its totient is φ = 55962377592.

The previous prime is 83943566383. The next prime is 83943566401. The reversal of 83943566397 is 79366534938.

83943566397 is a `hidden beast` number, since 8 + 39 + 4 + 3 + 566 + 39 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68901525081 + 15042041316 = 262491^2 + 122646^2 .

It is not a de Polignac number, because 83943566397 - 2⁴ = 83943566381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83943566197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4663531458 + ... + 4663531475.

It is an arithmetic number, because the mean of its divisors is an integer number (20208636357).

Almost surely, 2^83943566397 is an apocalyptic number.

It is an amenable number.

83943566397 is a deficient number, since it is larger than the sum of its proper divisors (37308251745).

83943566397 is a wasteful number, since it uses less digits than its factorization.

83943566397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9327062939 (or 9327062936 counting only the distinct ones).

The product of its digits is 88179840, while the sum is 63.

The spelling of 83943566397 in words is "eighty-three billion, nine hundred forty-three million, five hundred sixty-six thousand, three hundred ninety-seven".