20143557197 has 2 divisors, whose sum is σ = 20143557198. Its totient is φ = 20143557196.

The previous prime is 20143557163. The next prime is 20143557211. The reversal of 20143557197 is 79175534102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11422051876 + 8721505321 = 106874^2 + 93389^2 .

It is a cyclic number.

It is not a de Polignac number, because 20143557197 - 2⁸ = 20143556941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20143553197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071778598 + 10071778599.

It is an arithmetic number, because the mean of its divisors is an integer number (10071778599).

Almost surely, 2^20143557197 is an apocalyptic number.

It is an amenable number.

20143557197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20143557197 is an equidigital number, since it uses as much as digits as its factorization.

20143557197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 44.

The spelling of 20143557197 in words is "twenty billion, one hundred forty-three million, five hundred fifty-seven thousand, one hundred ninety-seven".