81840185302 has 8 divisors (see below), whose sum is σ = 124772741712. Its totient is φ = 40249271400.

The previous prime is 81840185279. The next prime is 81840185303. The reversal of 81840185302 is 20358104818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81840185303) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 335410474 + ... + 335410717.

It is an arithmetic number, because the mean of its divisors is an integer number (15596592714).

Almost surely, 2^81840185302 is an apocalyptic number.

81840185302 is a deficient number, since it is larger than the sum of its proper divisors (42932556410).

81840185302 is a wasteful number, since it uses less digits than its factorization.

81840185302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670821254.

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 81840185302 in words is "eighty-one billion, eight hundred forty million, one hundred eighty-five thousand, three hundred two".