82551781663 has 4 divisors (see below), whose sum is σ = 88901918728. Its totient is φ = 76201644600.

The previous prime is 82551781661. The next prime is 82551781667. The reversal of 82551781663 is 36618715528.

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

It is a cyclic number.

It is not a de Polignac number, because 82551781663 - 2¹ = 82551781661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82551781663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82551781661) 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 3 ways as a sum of consecutive naturals, for example, 3175068513 + ... + 3175068538.

It is an arithmetic number, because the mean of its divisors is an integer number (22225479682).

Almost surely, 2^82551781663 is an apocalyptic number.

82551781663 is a deficient number, since it is larger than the sum of its proper divisors (6350137065).

82551781663 is a wasteful number, since it uses less digits than its factorization.

82551781663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6350137064.

The product of its digits is 2419200, while the sum is 52.

The spelling of 82551781663 in words is "eighty-two billion, five hundred fifty-one million, seven hundred eighty-one thousand, six hundred sixty-three".