83445781549 has 12 divisors (see below), whose sum is σ = 90710086356. Its totient is φ = 76727119872.

The previous prime is 83445781537. The next prime is 83445781571. The reversal of 83445781549 is 94518754438.

It can be written as a sum of positive squares in 6 ways, for example, as 276989449 + 83168792100 = 16643^2 + 288390^2 .

It is not a de Polignac number, because 83445781549 - 2¹³ = 83445773357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83445781493 and 83445781502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83445781049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 917194 + ... + 1004059.

It is an arithmetic number, because the mean of its divisors is an integer number (7559173863).

Almost surely, 2^83445781549 is an apocalyptic number.

It is an amenable number.

83445781549 is a deficient number, since it is larger than the sum of its proper divisors (7264304807).

83445781549 is a wasteful number, since it uses less digits than its factorization.

83445781549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921536 (or 1921523 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 58.

The spelling of 83445781549 in words is "eighty-three billion, four hundred forty-five million, seven hundred eighty-one thousand, five hundred forty-nine".