81994508662 has 16 divisors (see below), whose sum is σ = 134734233600. Its totient is φ = 37114286440.

The previous prime is 81994508639. The next prime is 81994508663. The reversal of 81994508662 is 26680549918.

It is a super-3 number, since 3×81994508662³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81994508597 and 81994508606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81994508663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7791862 + ... + 7802377.

It is an arithmetic number, because the mean of its divisors is an integer number (8420889600).

Almost surely, 2^81994508662 is an apocalyptic number.

81994508662 is a deficient number, since it is larger than the sum of its proper divisors (52739724938).

81994508662 is a wasteful number, since it uses less digits than its factorization.

81994508662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15594491.

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 81994508662 in words is "eighty-one billion, nine hundred ninety-four million, five hundred eight thousand, six hundred sixty-two".