81109046460 has 288 divisors, whose sum is σ = 261060795072. Its totient is φ = 18700369920.

The previous prime is 81109046437. The next prime is 81109046479. The reversal of 81109046460 is 6464090118.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 54325474 + ... + 54326966.

It is an arithmetic number, because the mean of its divisors is an integer number (906461094).

Almost surely, 2^81109046460 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81109046460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130530397536).

81109046460 is an abundant number, since it is smaller than the sum of its proper divisors (179951748612).

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

81109046460 is a wasteful number, since it uses less digits than its factorization.

81109046460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793 (or 1774 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 81109046460 in words is "eighty-one billion, one hundred nine million, forty-six thousand, four hundred sixty".