20000166797 has 4 divisors (see below), whose sum is σ = 21538641180. Its totient is φ = 18461692416.

The previous prime is 20000166793. The next prime is 20000166847. The reversal of 20000166797 is 79766100002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7699360516 + 12300806281 = 87746^2 + 110909^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000166797 - 2² = 20000166793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20000166797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000166793) 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, 769237172 + ... + 769237197.

It is an arithmetic number, because the mean of its divisors is an integer number (5384660295).

Almost surely, 2^20000166797 is an apocalyptic number.

It is an amenable number.

20000166797 is a deficient number, since it is larger than the sum of its proper divisors (1538474383).

20000166797 is a wasteful number, since it uses less digits than its factorization.

20000166797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538474382.

The product of its (nonzero) digits is 31752, while the sum is 38.

Adding to 20000166797 its reverse (79766100002), we get a palindrome (99766266799).

The spelling of 20000166797 in words is "twenty billion, one hundred sixty-six thousand, seven hundred ninety-seven".