20154368197 has 2 divisors, whose sum is σ = 20154368198. Its totient is φ = 20154368196.

The previous prime is 20154368153. The next prime is 20154368231. The reversal of 20154368197 is 79186345102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17949032676 + 2205335521 = 133974^2 + 46961^2 .

It is a cyclic number.

It is not a de Polignac number, because 20154368197 - 2¹¹ = 20154366149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20154368107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077184098 + 10077184099.

It is an arithmetic number, because the mean of its divisors is an integer number (10077184099).

It is a 1-persistent number, because it is pandigital, but 2⋅20154368197 = 40308736394 is not.

Almost surely, 2^20154368197 is an apocalyptic number.

It is an amenable number.

20154368197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20154368197 is an equidigital number, since it uses as much as digits as its factorization.

20154368197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 20154368197 in words is "twenty billion, one hundred fifty-four million, three hundred sixty-eight thousand, one hundred ninety-seven".