81698180303 has 4 divisors (see below), whose sum is σ = 81739464840. Its totient is φ = 81656895768.

The previous prime is 81698180273. The next prime is 81698180309. The reversal of 81698180303 is 30308189618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81698180303 - 2¹⁴ = 81698163919 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 (81698180309) 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, 20639300 + ... + 20643257.

It is an arithmetic number, because the mean of its divisors is an integer number (20434866210).

Almost surely, 2^81698180303 is an apocalyptic number.

81698180303 is a deficient number, since it is larger than the sum of its proper divisors (41284537).

81698180303 is a wasteful number, since it uses less digits than its factorization.

81698180303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41284536.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 81698180303 in words is "eighty-one billion, six hundred ninety-eight million, one hundred eighty thousand, three hundred three".