81963960146 has 8 divisors (see below), whose sum is σ = 123298221900. Its totient is φ = 40864552848.

The previous prime is 81963960077. The next prime is 81963960161. The reversal of 81963960146 is 64106936918.

It can be written as a sum of positive squares in 2 ways, for example, as 76493730625 + 5470229521 = 276575^2 + 73961^2 .

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

It is an unprimeable number.

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, 58712741 + ... + 58714136.

Almost surely, 2^81963960146 is an apocalyptic number.

81963960146 is a deficient number, since it is larger than the sum of its proper divisors (41334261754).

81963960146 is a wasteful number, since it uses less digits than its factorization.

81963960146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117427228.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 81963960146 in words is "eighty-one billion, nine hundred sixty-three million, nine hundred sixty thousand, one hundred forty-six".