81680610254 has 16 divisors (see below), whose sum is σ = 124511642640. Its totient is φ = 40180813440.

The previous prime is 81680610251. The next prime is 81680610299. The reversal of 81680610254 is 45201608618.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81680610251) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 980849 + ... + 1060860.

It is an arithmetic number, because the mean of its divisors is an integer number (7781977665).

Almost surely, 2^81680610254 is an apocalyptic number.

81680610254 is a deficient number, since it is larger than the sum of its proper divisors (42831032386).

81680610254 is a wasteful number, since it uses less digits than its factorization.

81680610254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042035.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 81680610254 in words is "eighty-one billion, six hundred eighty million, six hundred ten thousand, two hundred fifty-four".