81763832485 has 8 divisors (see below), whose sum is σ = 103888163736. Its totient is φ = 61563356160.

The previous prime is 81763832477. The next prime is 81763832509. The reversal of 81763832485 is 58423836718.

It can be written as a sum of positive squares in 4 ways, for example, as 35905323169 + 45858509316 = 189487^2 + 214146^2 .

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

It is not a de Polignac number, because 81763832485 - 2³ = 81763832477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480963636 + ... + 480963805.

It is an arithmetic number, because the mean of its divisors is an integer number (12986020467).

Almost surely, 2^81763832485 is an apocalyptic number.

81763832485 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81763832485 is a deficient number, since it is larger than the sum of its proper divisors (22124331251).

81763832485 is a wasteful number, since it uses less digits than its factorization.

81763832485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961927463.

The product of its digits is 7741440, while the sum is 55.

The spelling of 81763832485 in words is "eighty-one billion, seven hundred sixty-three million, eight hundred thirty-two thousand, four hundred eighty-five".