81633677090 has 48 divisors (see below), whose sum is σ = 171078096384. Its totient is φ = 27964591200.

The previous prime is 81633677071. The next prime is 81633677131. The reversal of 81633677090 is 9077633618.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 502655 + ... + 644925.

It is an arithmetic number, because the mean of its divisors is an integer number (3564127008).

Almost surely, 2^81633677090 is an apocalyptic number.

81633677090 is an abundant number, since it is smaller than the sum of its proper divisors (89444419294).

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

81633677090 is a wasteful number, since it uses less digits than its factorization.

81633677090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143463 (or 143456 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 50.

The spelling of 81633677090 in words is "eighty-one billion, six hundred thirty-three million, six hundred seventy-seven thousand, ninety".