1698603838157 has 2 divisors, whose sum is σ = 1698603838158. Its totient is φ = 1698603838156.

The previous prime is 1698603838103. The next prime is 1698603838189. The reversal of 1698603838157 is 7518383068961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 977371481641 + 721232356516 = 988621^2 + 849254^2 .

It is an emirp because it is prime and its reverse (7518383068961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1698603838157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1698603838093 and 1698603838102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1698603838457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 849301919078 + 849301919079.

It is an arithmetic number, because the mean of its divisors is an integer number (849301919079).

Almost surely, 2^{1698603838157} is an apocalyptic number.

It is an amenable number.

1698603838157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1698603838157 is an equidigital number, since it uses as much as digits as its factorization.

1698603838157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 1698603838157 in words is "one trillion, six hundred ninety-eight billion, six hundred three million, eight hundred thirty-eight thousand, one hundred fifty-seven".