81540949248 has 108 divisors (see below), whose sum is σ = 256475707488. Its totient is φ = 24709370880.

The previous prime is 81540949223. The next prime is 81540949261. The reversal of 81540949248 is 84294904518.

It is a happy number.

81540949248 is a `hidden beast` number, since 8 + 1 + 540 + 9 + 4 + 92 + 4 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81540949194 and 81540949203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1583340 + ... + 1634027.

Almost surely, 2^81540949248 is an apocalyptic number.

81540949248 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81540949248 is an abundant number, since it is smaller than the sum of its proper divisors (174934758240).

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

81540949248 is a wasteful number, since it uses less digits than its factorization.

81540949248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217400 (or 3217383 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 81540949248 in words is "eighty-one billion, five hundred forty million, nine hundred forty-nine thousand, two hundred forty-eight".