81738572803 has 8 divisors (see below), whose sum is σ = 82996239200. Its totient is φ = 80489376000.

The previous prime is 81738572791. The next prime is 81738572827. The reversal of 81738572803 is 30827583718.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81738572803 is a prime.

It is a super-3 number, since 3×81738572803³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81738572203) 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 7 ways as a sum of consecutive naturals, for example, 2097948 + ... + 2136553.

It is an arithmetic number, because the mean of its divisors is an integer number (10374529900).

Almost surely, 2^81738572803 is an apocalyptic number.

81738572803 is a deficient number, since it is larger than the sum of its proper divisors (1257666397).

81738572803 is a wasteful number, since it uses less digits than its factorization.

81738572803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4234797.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 81738572803 in words is "eighty-one billion, seven hundred thirty-eight million, five hundred seventy-two thousand, eight hundred three".