81623126548530 has 384 divisors, whose sum is σ = 261676155985920. Its totient is φ = 17236239920640.

The previous prime is 81623126548463. The next prime is 81623126548573. The reversal of 81623126548530 is 3584562132618.

81623126548530 is a `hidden beast` number, since 8 + 1 + 6 + 2 + 3 + 1 + 2 + 65 + 48 + 530 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 155575545 + ... + 156099315.

It is an arithmetic number, because the mean of its divisors is an integer number (681448322880).

Almost surely, 2^{81623126548530} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81623126548530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130838077992960).

81623126548530 is an abundant number, since it is smaller than the sum of its proper divisors (180053029437390).

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

81623126548530 is a wasteful number, since it uses less digits than its factorization.

81623126548530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524134 (or 524131 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 81623126548530 in words is "eighty-one trillion, six hundred twenty-three billion, one hundred twenty-six million, five hundred forty-eight thousand, five hundred thirty".