19698860568157 has 2 divisors, whose sum is σ = 19698860568158. Its totient is φ = 19698860568156.

The previous prime is 19698860568091. The next prime is 19698860568229. The reversal of 19698860568157 is 75186506889691.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16010793819801 + 3688066748356 = 4001349^2 + 1920434^2 .

It is a cyclic number.

It is not a de Polignac number, because 19698860568157 - 2⁷ = 19698860568029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19698860568757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9849430284078 + 9849430284079.

It is an arithmetic number, because the mean of its divisors is an integer number (9849430284079).

Almost surely, 2^{19698860568157} is an apocalyptic number.

It is an amenable number.

19698860568157 is a deficient number, since it is larger than the sum of its proper divisors (1).

19698860568157 is an equidigital number, since it uses as much as digits as its factorization.

19698860568157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1567641600, while the sum is 79.

The spelling of 19698860568157 in words is "nineteen trillion, six hundred ninety-eight billion, eight hundred sixty million, five hundred sixty-eight thousand, one hundred fifty-seven".