81655611223 has 8 divisors (see below), whose sum is σ = 82089534960. Its totient is φ = 81222338880.

The previous prime is 81655611157. The next prime is 81655611227. The reversal of 81655611223 is 32211655618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81655611223 is a prime.

It is a super-3 number, since 3×81655611223³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81655611227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89563 + ... + 413923.

It is an arithmetic number, because the mean of its divisors is an integer number (10261191870).

Almost surely, 2^81655611223 is an apocalyptic number.

81655611223 is a deficient number, since it is larger than the sum of its proper divisors (433923737).

81655611223 is a wasteful number, since it uses less digits than its factorization.

81655611223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325697.

The product of its digits is 86400, while the sum is 40.

The spelling of 81655611223 in words is "eighty-one billion, six hundred fifty-five million, six hundred eleven thousand, two hundred twenty-three".