81074856549 has 32 divisors (see below), whose sum is σ = 116592537600. Its totient is φ = 49990311360.

The previous prime is 81074856539. The next prime is 81074856581. The reversal of 81074856549 is 94565847018.

It is not a de Polignac number, because 81074856549 - 2¹³ = 81074848357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81074856539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85092 + ... + 411570.

It is an arithmetic number, because the mean of its divisors is an integer number (3643516800).

Almost surely, 2^81074856549 is an apocalyptic number.

It is an amenable number.

81074856549 is a deficient number, since it is larger than the sum of its proper divisors (35517681051).

81074856549 is a wasteful number, since it uses less digits than its factorization.

81074856549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326625.

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 81074856549 in words is "eighty-one billion, seventy-four million, eight hundred fifty-six thousand, five hundred forty-nine".