81011099430 has 384 divisors, whose sum is σ = 238132597248. Its totient is φ = 19738847232.

The previous prime is 81011099419. The next prime is 81011099443. The reversal of 81011099430 is 3499011018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 356876977 + ... + 356877203.

It is an arithmetic number, because the mean of its divisors is an integer number (620136972).

Almost surely, 2^81011099430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81011099430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119066298624).

81011099430 is an abundant number, since it is smaller than the sum of its proper divisors (157121497818).

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

81011099430 is a wasteful number, since it uses less digits than its factorization.

81011099430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The spelling of 81011099430 in words is "eighty-one billion, eleven million, ninety-nine thousand, four hundred thirty".