81885033830 has 32 divisors (see below), whose sum is σ = 148901838624. Its totient is φ = 32419270656.

The previous prime is 81885033829. The next prime is 81885033869. The reversal of 81885033830 is 3833058818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1200524 + ... + 1266896.

It is an arithmetic number, because the mean of its divisors is an integer number (4653182457).

Almost surely, 2^81885033830 is an apocalyptic number.

81885033830 is a deficient number, since it is larger than the sum of its proper divisors (67016804794).

81885033830 is a wasteful number, since it uses less digits than its factorization.

81885033830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67640.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 81885033830 in words is "eighty-one billion, eight hundred eighty-five million, thirty-three thousand, eight hundred thirty".