1981081662 has 24 divisors (see below), whose sum is σ = 4609047816. Its totient is φ = 566023248.

The previous prime is 1981081579. The next prime is 1981081667. The reversal of 1981081662 is 2661801891.

1981081662 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981081667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3368893 + ... + 3369480.

It is an arithmetic number, because the mean of its divisors is an integer number (192043659).

Almost surely, 2^1981081662 is an apocalyptic number.

1981081662 is an abundant number, since it is smaller than the sum of its proper divisors (2627966154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1981081662 is a wasteful number, since it uses less digits than its factorization.

1981081662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6738392 (or 6738385 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1981081662 is about 44509.3435359364. The cubic root of 1981081662 is about 1255.9358557685.

The spelling of 1981081662 in words is "one billion, nine hundred eighty-one million, eighty-one thousand, six hundred sixty-two".