81748084749 has 8 divisors (see below), whose sum is σ = 109249174272. Its totient is φ = 54372859200.

The previous prime is 81748084727. The next prime is 81748084753. The reversal of 81748084749 is 94748084718.

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

It is not a de Polignac number, because 81748084749 - 2¹² = 81748080653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81748084692 and 81748084701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81748084849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31464477 + ... + 31467074.

It is an arithmetic number, because the mean of its divisors is an integer number (13656146784).

Almost surely, 2^81748084749 is an apocalyptic number.

It is an amenable number.

81748084749 is a deficient number, since it is larger than the sum of its proper divisors (27501089523).

81748084749 is a wasteful number, since it uses less digits than its factorization.

81748084749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62931987.

The product of its (nonzero) digits is 14450688, while the sum is 60.

The spelling of 81748084749 in words is "eighty-one billion, seven hundred forty-eight million, eighty-four thousand, seven hundred forty-nine".