19718097682057 has 2 divisors, whose sum is σ = 19718097682058. Its totient is φ = 19718097682056.

The previous prime is 19718097682051. The next prime is 19718097682109. The reversal of 19718097682057 is 75028679081791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18699086171536 + 1019011510521 = 4324244^2 + 1009461^2 .

It is a cyclic number.

It is not a de Polignac number, because 19718097682057 - 2⁴³ = 10922004659849 is a prime.

It is not a weakly prime, because it can be changed into another prime (19718097682051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9859048841028 + 9859048841029.

It is an arithmetic number, because the mean of its divisors is an integer number (9859048841029).

Almost surely, 2^{19718097682057} is an apocalyptic number.

It is an amenable number.

19718097682057 is a deficient number, since it is larger than the sum of its proper divisors (1).

19718097682057 is an equidigital number, since it uses as much as digits as its factorization.

19718097682057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 106686720, while the sum is 70.

The spelling of 19718097682057 in words is "nineteen trillion, seven hundred eighteen billion, ninety-seven million, six hundred eighty-two thousand, fifty-seven".