81455686332 has 48 divisors (see below), whose sum is σ = 195423624480. Its totient is φ = 26387811072.

The previous prime is 81455686309. The next prime is 81455686399. The reversal of 81455686332 is 23368655418.

It is a super-2 number, since 2×81455686332² (a number of 23 digits) contains 22 as substring.

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, 284794 + ... + 493982.

It is an arithmetic number, because the mean of its divisors is an integer number (4071325510).

Almost surely, 2^81455686332 is an apocalyptic number.

It is an amenable number.

81455686332 is an abundant number, since it is smaller than the sum of its proper divisors (113967938148).

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

81455686332 is a wasteful number, since it uses less digits than its factorization.

81455686332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210110 (or 210108 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 51.

The spelling of 81455686332 in words is "eighty-one billion, four hundred fifty-five million, six hundred eighty-six thousand, three hundred thirty-two".