83365561 has 2 divisors, whose sum is σ = 83365562. Its totient is φ = 83365560.

The previous prime is 83365553. The next prime is 83365577. The reversal of 83365561 is 16556338.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45481536 + 37884025 = 6744^2 + 6155^2 .

It is a cyclic number.

It is not a de Polignac number, because 83365561 - 2³ = 83365553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83365561.

It is not a weakly prime, because it can be changed into another prime (83365531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41682780 + 41682781.

It is an arithmetic number, because the mean of its divisors is an integer number (41682781).

Almost surely, 2^83365561 is an apocalyptic number.

It is an amenable number.

83365561 is a deficient number, since it is larger than the sum of its proper divisors (1).

83365561 is an equidigital number, since it uses as much as digits as its factorization.

83365561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 37.

The square root of 83365561 is about 9130.4743031236. The cubic root of 83365561 is about 436.8465320312.

The spelling of 83365561 in words is "eighty-three million, three hundred sixty-five thousand, five hundred sixty-one".