81683055461 has 16 divisors (see below), whose sum is σ = 93592811520. Its totient is φ = 69833622960.

The previous prime is 81683055431. The next prime is 81683055469. The reversal of 81683055461 is 16455038618.

It is a cyclic number.

It is not a de Polignac number, because 81683055461 - 2¹⁰ = 81683054437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81683055469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10689080 + ... + 10696718.

It is an arithmetic number, because the mean of its divisors is an integer number (5849550720).

Almost surely, 2^81683055461 is an apocalyptic number.

It is an amenable number.

81683055461 is a deficient number, since it is larger than the sum of its proper divisors (11909756059).

81683055461 is a wasteful number, since it uses less digits than its factorization.

81683055461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11384.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 81683055461 in words is "eighty-one billion, six hundred eighty-three million, fifty-five thousand, four hundred sixty-one".