81522242487135 has 96 divisors (see below), whose sum is σ = 153475632430848. Its totient is φ = 39868420055040.

The previous prime is 81522242487109. The next prime is 81522242487143. The reversal of 81522242487135 is 53178424222518.

81522242487135 is a `hidden beast` number, since 8 + 1 + 5 + 2 + 2 + 2 + 424 + 87 + 135 = 666.

It is not a de Polignac number, because 81522242487135 - 2²³ = 81522234098527 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21217594 + ... + 24763496.

It is an arithmetic number, because the mean of its divisors is an integer number (1598704504488).

Almost surely, 2^{81522242487135} is an apocalyptic number.

81522242487135 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81522242487135 is a deficient number, since it is larger than the sum of its proper divisors (71953389943713).

81522242487135 is a wasteful number, since it uses less digits than its factorization.

81522242487135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546705 (or 3546702 counting only the distinct ones).

The product of its digits is 8601600, while the sum is 54.

The spelling of 81522242487135 in words is "eighty-one trillion, five hundred twenty-two billion, two hundred forty-two million, four hundred eighty-seven thousand, one hundred thirty-five".