81040151478 has 192 divisors, whose sum is σ = 210161407680. Its totient is φ = 20598251520.

The previous prime is 81040151477. The next prime is 81040151519. The reversal of 81040151478 is 87415104018.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81040151477) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4644226 + ... + 4661642.

It is an arithmetic number, because the mean of its divisors is an integer number (1094590665).

Almost surely, 2^81040151478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81040151478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105080703840).

81040151478 is an abundant number, since it is smaller than the sum of its proper divisors (129121256202).

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

81040151478 is a wasteful number, since it uses less digits than its factorization.

81040151478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17503 (or 17492 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The spelling of 81040151478 in words is "eighty-one billion, forty million, one hundred fifty-one thousand, four hundred seventy-eight".