81758653583 has 4 divisors (see below), whose sum is σ = 81783743880. Its totient is φ = 81733563288.

The previous prime is 81758653553. The next prime is 81758653601. The reversal of 81758653583 is 38535685718.

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 81758653583 - 2¹⁴ = 81758637199 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 (81758653553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12540260 + ... + 12546777.

It is an arithmetic number, because the mean of its divisors is an integer number (20445935970).

Almost surely, 2^81758653583 is an apocalyptic number.

81758653583 is a deficient number, since it is larger than the sum of its proper divisors (25090297).

81758653583 is a wasteful number, since it uses less digits than its factorization.

81758653583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25090296.

The product of its digits is 24192000, while the sum is 59.

The spelling of 81758653583 in words is "eighty-one billion, seven hundred fifty-eight million, six hundred fifty-three thousand, five hundred eighty-three".