81783541299 has 8 divisors (see below), whose sum is σ = 115459117200. Its totient is φ = 51315163136.

The previous prime is 81783541291. The next prime is 81783541319. The reversal of 81783541299 is 99214538718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81783541299 - 2³ = 81783541291 is a prime.

It is a super-3 number, since 3×81783541299³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81783541291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 801799374 + ... + 801799475.

It is an arithmetic number, because the mean of its divisors is an integer number (14432389650).

Almost surely, 2^81783541299 is an apocalyptic number.

81783541299 is a deficient number, since it is larger than the sum of its proper divisors (33675575901).

81783541299 is a wasteful number, since it uses less digits than its factorization.

81783541299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603598869.

The product of its digits is 4354560, while the sum is 57.

The spelling of 81783541299 in words is "eighty-one billion, seven hundred eighty-three million, five hundred forty-one thousand, two hundred ninety-nine".