80665165650 has 24 divisors (see below), whose sum is σ = 200049611184. Its totient is φ = 21510710800.

The previous prime is 80665165649. The next prime is 80665165657. The reversal of 80665165650 is 5656156608.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 80665165650.

It is not an unprimeable number, because it can be changed into a prime (80665165657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268883736 + ... + 268884035.

It is an arithmetic number, because the mean of its divisors is an integer number (8335400466).

Almost surely, 2^80665165650 is an apocalyptic number.

80665165650 is an abundant number, since it is smaller than the sum of its proper divisors (119384445534).

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

80665165650 is a wasteful number, since it uses less digits than its factorization.

80665165650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537767786 (or 537767781 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 48.

The spelling of 80665165650 in words is "eighty billion, six hundred sixty-five million, one hundred sixty-five thousand, six hundred fifty".