83781775145 has 4 divisors (see below), whose sum is σ = 100538130180. Its totient is φ = 67025420112.

The previous prime is 83781775127. The next prime is 83781775153. The reversal of 83781775145 is 54157718738.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22311994384 + 61469780761 = 149372^2 + 247931^2 .

It is a cyclic number.

It is not a de Polignac number, because 83781775145 - 2³² = 79486807849 is a prime.

It is a super-3 number, since 3×83781775145³ (a number of 34 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8378177510 + ... + 8378177519.

It is an arithmetic number, because the mean of its divisors is an integer number (25134532545).

Almost surely, 2^83781775145 is an apocalyptic number.

It is an amenable number.

83781775145 is a deficient number, since it is larger than the sum of its proper divisors (16756355035).

83781775145 is a wasteful number, since it uses less digits than its factorization.

83781775145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16756355034.

The product of its digits is 6585600, while the sum is 56.

The spelling of 83781775145 in words is "eighty-three billion, seven hundred eighty-one million, seven hundred seventy-five thousand, one hundred forty-five".