81491483526 has 32 divisors (see below), whose sum is σ = 172656448128. Its totient is φ = 25553178240.

The previous prime is 81491483503. The next prime is 81491483537. The reversal of 81491483526 is 62538419418.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6481 + ... + 403763.

It is an arithmetic number, because the mean of its divisors is an integer number (5395514004).

Almost surely, 2^81491483526 is an apocalyptic number.

81491483526 is an abundant number, since it is smaller than the sum of its proper divisors (91164964602).

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

81491483526 is a wasteful number, since it uses less digits than its factorization.

81491483526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399316.

The product of its digits is 1658880, while the sum is 51.

The spelling of 81491483526 in words is "eighty-one billion, four hundred ninety-one million, four hundred eighty-three thousand, five hundred twenty-six".