81748084693 has 4 divisors (see below), whose sum is σ = 89179728768. Its totient is φ = 74316440620.

The previous prime is 81748084661. The next prime is 81748084699. The reversal of 81748084693 is 39648084718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81748084693 - 2⁵ = 81748084661 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 (81748084699) 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, 3715822021 + ... + 3715822042.

It is an arithmetic number, because the mean of its divisors is an integer number (22294932192).

Almost surely, 2^81748084693 is an apocalyptic number.

It is an amenable number.

81748084693 is a deficient number, since it is larger than the sum of its proper divisors (7431644075).

81748084693 is a wasteful number, since it uses less digits than its factorization.

81748084693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7431644074.

The product of its (nonzero) digits is 9289728, while the sum is 58.

The spelling of 81748084693 in words is "eighty-one billion, seven hundred forty-eight million, eighty-four thousand, six hundred ninety-three".