20168488897 has 2 divisors, whose sum is σ = 20168488898. Its totient is φ = 20168488896.

The previous prime is 20168488889. The next prime is 20168488903. The reversal of 20168488897 is 79888486102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19000968336 + 1167520561 = 137844^2 + 34169^2 .

It is a cyclic number.

It is not a de Polignac number, because 20168488897 - 2³ = 20168488889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20168488817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10084244448 + 10084244449.

It is an arithmetic number, because the mean of its divisors is an integer number (10084244449).

Almost surely, 2^20168488897 is an apocalyptic number.

It is an amenable number.

20168488897 is a deficient number, since it is larger than the sum of its proper divisors (1).

20168488897 is an equidigital number, since it uses as much as digits as its factorization.

20168488897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12386304, while the sum is 61.

The spelling of 20168488897 in words is "twenty billion, one hundred sixty-eight million, four hundred eighty-eight thousand, eight hundred ninety-seven".