81927712455 has 32 divisors (see below), whose sum is σ = 133036344000. Its totient is φ = 43047662592.

The previous prime is 81927712441. The next prime is 81927712469. The reversal of 81927712455 is 55421772918.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81927712441) and next prime (81927712469).

It is not a de Polignac number, because 81927712455 - 2⁴ = 81927712439 is a prime.

It is a super-3 number, since 3×81927712455³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81927712398 and 81927712407.

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 31 ways as a sum of consecutive naturals, for example, 259021 + ... + 480569.

It is an arithmetic number, because the mean of its divisors is an integer number (4157385750).

Almost surely, 2^81927712455 is an apocalyptic number.

81927712455 is a deficient number, since it is larger than the sum of its proper divisors (51108631545).

81927712455 is a wasteful number, since it uses less digits than its factorization.

81927712455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221923.

The product of its digits is 1411200, while the sum is 51.

The spelling of 81927712455 in words is "eighty-one billion, nine hundred twenty-seven million, seven hundred twelve thousand, four hundred fifty-five".