81600654090 has 32 divisors (see below), whose sum is σ = 200396028096. Its totient is φ = 21254123520.

The previous prime is 81600654059. The next prime is 81600654119. The reversal of 81600654090 is 9045600618.

It is a Curzon 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, 31626871 + ... + 31629450.

It is an arithmetic number, because the mean of its divisors is an integer number (6262375878).

Almost surely, 2^81600654090 is an apocalyptic number.

81600654090 is an abundant number, since it is smaller than the sum of its proper divisors (118795374006).

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

81600654090 is a wasteful number, since it uses less digits than its factorization.

81600654090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63256374.

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 81600654090 in words is "eighty-one billion, six hundred million, six hundred fifty-four thousand, ninety".