81149001790 has 32 divisors (see below), whose sum is σ = 148731176160. Its totient is φ = 31869216384.

The previous prime is 81149001779. The next prime is 81149001797. The reversal of 81149001790 is 9710094118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81149001797) 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, 383944 + ... + 556516.

It is an arithmetic number, because the mean of its divisors is an integer number (4647849255).

Almost surely, 2^81149001790 is an apocalyptic number.

81149001790 is a deficient number, since it is larger than the sum of its proper divisors (67582174370).

81149001790 is a wasteful number, since it uses less digits than its factorization.

81149001790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173436.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 81149001790 in words is "eighty-one billion, one hundred forty-nine million, one thousand, seven hundred ninety".