81980962677 has 16 divisors (see below), whose sum is σ = 121468905280. Its totient is φ = 54646942896.

The previous prime is 81980962669. The next prime is 81980962703. The reversal of 81980962677 is 77626908918.

It is not a de Polignac number, because 81980962677 - 2³ = 81980962669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81980962577) 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, 22818 + ... + 405564.

It is an arithmetic number, because the mean of its divisors is an integer number (7591806580).

Almost surely, 2^81980962677 is an apocalyptic number.

It is an amenable number.

81980962677 is a deficient number, since it is larger than the sum of its proper divisors (39487942603).

81980962677 is a wasteful number, since it uses less digits than its factorization.

81980962677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390689 (or 390683 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 81980962677 in words is "eighty-one billion, nine hundred eighty million, nine hundred sixty-two thousand, six hundred seventy-seven".