81655614458 has 16 divisors (see below), whose sum is σ = 134001151200. Its totient is φ = 37009834800.

The previous prime is 81655614451. The next prime is 81655614493. The reversal of 81655614458 is 85441655618.

It is a super-3 number, since 3×81655614458³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81655614451) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5309828 + ... + 5325183.

It is an arithmetic number, because the mean of its divisors is an integer number (8375071950).

Almost surely, 2^81655614458 is an apocalyptic number.

81655614458 is a deficient number, since it is larger than the sum of its proper divisors (52345536742).

81655614458 is a wasteful number, since it uses less digits than its factorization.

81655614458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10635373.

The product of its digits is 4608000, while the sum is 53.

The spelling of 81655614458 in words is "eighty-one billion, six hundred fifty-five million, six hundred fourteen thousand, four hundred fifty-eight".