81486389526 has 16 divisors (see below), whose sum is σ = 163171294128. Its totient is φ = 27129044000.

The previous prime is 81486389519. The next prime is 81486389557. The reversal of 81486389526 is 62598368418.

It is a super-3 number, since 3×81486389526³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81486389526.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8266125 + ... + 8275976.

It is an arithmetic number, because the mean of its divisors is an integer number (10198205883).

Almost surely, 2^81486389526 is an apocalyptic number.

81486389526 is an abundant number, since it is smaller than the sum of its proper divisors (81684904602).

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

81486389526 is a wasteful number, since it uses less digits than its factorization.

81486389526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16542927.

The product of its digits is 19906560, while the sum is 60.

The spelling of 81486389526 in words is "eighty-one billion, four hundred eighty-six million, three hundred eighty-nine thousand, five hundred twenty-six".