81882630991 has 16 divisors (see below), whose sum is σ = 94232347200. Its totient is φ = 69696207360.

The previous prime is 81882630979. The next prime is 81882631027. The reversal of 81882630991 is 19903628818.

It is a cyclic number.

It is not a de Polignac number, because 81882630991 - 2¹⁵ = 81882598223 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 (81882634991) 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, 5517361 + ... + 5532181.

It is an arithmetic number, because the mean of its divisors is an integer number (5889521700).

Almost surely, 2^81882630991 is an apocalyptic number.

81882630991 is a deficient number, since it is larger than the sum of its proper divisors (12349716209).

81882630991 is a wasteful number, since it uses less digits than its factorization.

81882630991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20274.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 81882630991 in words is "eighty-one billion, eight hundred eighty-two million, six hundred thirty thousand, nine hundred ninety-one".