1698640819 has 2 divisors, whose sum is σ = 1698640820. Its totient is φ = 1698640818.

The previous prime is 1698640813. The next prime is 1698640829. The reversal of 1698640819 is 9180468961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1698640819 - 2¹³ = 1698632627 is a prime.

It is a super-2 number, since 2×1698640819² = 5770761263945981522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1698640813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 849320409 + 849320410.

It is an arithmetic number, because the mean of its divisors is an integer number (849320410).

Almost surely, 2^1698640819 is an apocalyptic number.

1698640819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1698640819 is an equidigital number, since it uses as much as digits as its factorization.

1698640819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 1698640819 is about 41214.5704696773. The cubic root of 1698640819 is about 1193.1650365968.

The spelling of 1698640819 in words is "one billion, six hundred ninety-eight million, six hundred forty thousand, eight hundred nineteen".