1688670553 has 2 divisors, whose sum is σ = 1688670554. Its totient is φ = 1688670552.

The previous prime is 1688670527. The next prime is 1688670559. The reversal of 1688670553 is 3550768861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1670111689 + 18558864 = 40867^2 + 4308^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688670553 - 2¹³ = 1688662361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1688670497 and 1688670506.

It is not a weakly prime, because it can be changed into another prime (1688670559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844335276 + 844335277.

It is an arithmetic number, because the mean of its divisors is an integer number (844335277).

Almost surely, 2^1688670553 is an apocalyptic number.

It is an amenable number.

1688670553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688670553 is an equidigital number, since it uses as much as digits as its factorization.

1688670553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The square root of 1688670553 is about 41093.4368604039. The cubic root of 1688670553 is about 1190.8260049154.

The spelling of 1688670553 in words is "one billion, six hundred eighty-eight million, six hundred seventy thousand, five hundred fifty-three".