83812642817 has 2 divisors, whose sum is σ = 83812642818. Its totient is φ = 83812642816.

The previous prime is 83812642787. The next prime is 83812642867. The reversal of 83812642817 is 71824621838.

It is an a-pointer prime, because the next prime (83812642867) can be obtained adding 83812642817 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81455443216 + 2357199601 = 285404^2 + 48551^2 .

It is a cyclic number.

It is not a de Polignac number, because 83812642817 - 2³² = 79517675521 is a prime.

It is not a weakly prime, because it can be changed into another prime (83812642867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41906321408 + 41906321409.

It is an arithmetic number, because the mean of its divisors is an integer number (41906321409).

Almost surely, 2^83812642817 is an apocalyptic number.

It is an amenable number.

83812642817 is a deficient number, since it is larger than the sum of its proper divisors (1).

83812642817 is an equidigital number, since it uses as much as digits as its factorization.

83812642817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 50.

The spelling of 83812642817 in words is "eighty-three billion, eight hundred twelve million, six hundred forty-two thousand, eight hundred seventeen".