81589717403 has 4 divisors (see below), whose sum is σ = 81592249200. Its totient is φ = 81587185608.

The previous prime is 81589717393. The next prime is 81589717421. The reversal of 81589717403 is 30471798518.

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 81589717403 - 2¹² = 81589713307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81589717423) 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, 1216928 + ... + 1282221.

It is an arithmetic number, because the mean of its divisors is an integer number (20398062300).

Almost surely, 2^81589717403 is an apocalyptic number.

81589717403 is a deficient number, since it is larger than the sum of its proper divisors (2531797).

81589717403 is a wasteful number, since it uses less digits than its factorization.

81589717403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531796.

The product of its (nonzero) digits is 1693440, while the sum is 53.

The spelling of 81589717403 in words is "eighty-one billion, five hundred eighty-nine million, seven hundred seventeen thousand, four hundred three".