20797171166 has 4 divisors (see below), whose sum is σ = 31195756752. Its totient is φ = 10398585582.

The previous prime is 20797171151. The next prime is 20797171177. The reversal of 20797171166 is 66117179702.

It is a semiprime because it is the product of two primes.

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 20797171166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5199292790 + ... + 5199292793.

It is an arithmetic number, because the mean of its divisors is an integer number (7798939188).

Almost surely, 2^20797171166 is an apocalyptic number.

20797171166 is a deficient number, since it is larger than the sum of its proper divisors (10398585586).

20797171166 is a wasteful number, since it uses less digits than its factorization.

20797171166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10398585585.

The product of its (nonzero) digits is 222264, while the sum is 47.

The spelling of 20797171166 in words is "twenty billion, seven hundred ninety-seven million, one hundred seventy-one thousand, one hundred sixty-six".