81402140002 has 16 divisors (see below), whose sum is σ = 130954786560. Its totient is φ = 37831380912.

The previous prime is 81402139999. The next prime is 81402140033. The reversal of 81402140002 is 20004120418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20207058 + ... + 20211085.

It is an arithmetic number, because the mean of its divisors is an integer number (8184674160).

Almost surely, 2^81402140002 is an apocalyptic number.

81402140002 is a deficient number, since it is larger than the sum of its proper divisors (49552646558).

81402140002 is a wasteful number, since it uses less digits than its factorization.

81402140002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40418217.

The product of its (nonzero) digits is 512, while the sum is 22.

The spelling of 81402140002 in words is "eighty-one billion, four hundred two million, one hundred forty thousand, two".