80421797666 has 32 divisors (see below), whose sum is σ = 140841953280. Its totient is φ = 33722926416.

The previous prime is 80421797657. The next prime is 80421797683. The reversal of 80421797666 is 66679712408.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 2390921 + ... + 2424323.

It is an arithmetic number, because the mean of its divisors is an integer number (4401311040).

Almost surely, 2^80421797666 is an apocalyptic number.

80421797666 is a deficient number, since it is larger than the sum of its proper divisors (60420155614).

80421797666 is a wasteful number, since it uses less digits than its factorization.

80421797666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37118.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 80421797666 in words is "eighty billion, four hundred twenty-one million, seven hundred ninety-seven thousand, six hundred sixty-six".