1688375573 has 2 divisors, whose sum is σ = 1688375574. Its totient is φ = 1688375572.

The previous prime is 1688375443. The next prime is 1688375603. The reversal of 1688375573 is 3755738861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 967023409 + 721352164 = 31097^2 + 26858^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1688375573 is a prime.

It is a super-2 number, since 2×1688375573² = 5701224151006156658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688374573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844187786 + 844187787.

It is an arithmetic number, because the mean of its divisors is an integer number (844187787).

Almost surely, 2^1688375573 is an apocalyptic number.

It is an amenable number.

1688375573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688375573 is an equidigital number, since it uses as much as digits as its factorization.

1688375573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 53.

The square root of 1688375573 is about 41089.8475660351. The cubic root of 1688375573 is about 1190.7566623371.

The spelling of 1688375573 in words is "one billion, six hundred eighty-eight million, three hundred seventy-five thousand, five hundred seventy-three".