1698804637949 has 2 divisors, whose sum is σ = 1698804637950. Its totient is φ = 1698804637948.

The previous prime is 1698804637921. The next prime is 1698804637951. The reversal of 1698804637949 is 9497364088961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1698804637924 + 25 = 1303382^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 1698804637949 - 2¹² = 1698804633853 is a prime.

Together with 1698804637951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1698804637919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 849402318974 + 849402318975.

It is an arithmetic number, because the mean of its divisors is an integer number (849402318975).

Almost surely, 2^{1698804637949} is an apocalyptic number.

It is an amenable number.

1698804637949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1698804637949 is an equidigital number, since it uses as much as digits as its factorization.

1698804637949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564350976, while the sum is 74.

The spelling of 1698804637949 in words is "one trillion, six hundred ninety-eight billion, eight hundred four million, six hundred thirty-seven thousand, nine hundred forty-nine".