81127545048 has 192 divisors, whose sum is σ = 253234425600. Its totient is φ = 23204931840.

The previous prime is 81127545043. The next prime is 81127545077. The reversal of 81127545048 is 84054572118.

81127545048 is a `hidden beast` number, since 81 + 1 + 27 + 545 + 0 + 4 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81127544994 and 81127545012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81127545043) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4158565 + ... + 4178027.

It is an arithmetic number, because the mean of its divisors is an integer number (1318929300).

Almost surely, 2^81127545048 is an apocalyptic number.

81127545048 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81127545048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126617212800).

81127545048 is an abundant number, since it is smaller than the sum of its proper divisors (172106880552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81127545048 is a wasteful number, since it uses less digits than its factorization.

81127545048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19782 (or 19775 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 81127545048 in words is "eighty-one billion, one hundred twenty-seven million, five hundred forty-five thousand, forty-eight".