81650187088 has 20 divisors (see below), whose sum is σ = 160199736640. Its totient is φ = 40308319584.

The previous prime is 81650187083. The next prime is 81650187121. The reversal of 81650187088 is 88078105618.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81650187083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32297070 + ... + 32299597.

It is an arithmetic number, because the mean of its divisors is an integer number (8009986832).

Almost surely, 2^81650187088 is an apocalyptic number.

It is an amenable number.

81650187088 is a deficient number, since it is larger than the sum of its proper divisors (78549549552).

81650187088 is a wasteful number, since it uses less digits than its factorization.

81650187088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64596754 (or 64596748 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 52.

The spelling of 81650187088 in words is "eighty-one billion, six hundred fifty million, one hundred eighty-seven thousand, eighty-eight".