1688456953 has 2 divisors, whose sum is σ = 1688456954. Its totient is φ = 1688456952.

The previous prime is 1688456947. The next prime is 1688456969. The reversal of 1688456953 is 3596548861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1682066169 + 6390784 = 41013^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688456953 - 2¹³ = 1688448761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1688456894 and 1688456903.

It is not a weakly prime, because it can be changed into another prime (1688456993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844228476 + 844228477.

It is an arithmetic number, because the mean of its divisors is an integer number (844228477).

Almost surely, 2^1688456953 is an apocalyptic number.

It is an amenable number.

1688456953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688456953 is an equidigital number, since it uses as much as digits as its factorization.

1688456953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6220800, while the sum is 55.

The square root of 1688456953 is about 41090.8378230476. The cubic root of 1688456953 is about 1190.7757935900.

It can be divided in two parts, 16884 and 56953, that added together give a palindrome (73837).

The spelling of 1688456953 in words is "one billion, six hundred eighty-eight million, four hundred fifty-six thousand, nine hundred fifty-three".