81655045518 has 32 divisors (see below), whose sum is σ = 166897345536. Its totient is φ = 26621254688.

The previous prime is 81655045513. The next prime is 81655045519. The reversal of 81655045518 is 81554055618.

It is a super-3 number, since 3×81655045518³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81655045513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324055 + ... + 517997.

It is an arithmetic number, because the mean of its divisors is an integer number (5215542048).

Almost surely, 2^81655045518 is an apocalyptic number.

81655045518 is an abundant number, since it is smaller than the sum of its proper divisors (85242300018).

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

81655045518 is a wasteful number, since it uses less digits than its factorization.

81655045518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195488.

The product of its (nonzero) digits is 960000, while the sum is 48.

The spelling of 81655045518 in words is "eighty-one billion, six hundred fifty-five million, forty-five thousand, five hundred eighteen".