1688633057 has 4 divisors (see below), whose sum is σ = 1689335856. Its totient is φ = 1687930260.

The previous prime is 1688633033. The next prime is 1688633071. The reversal of 1688633057 is 7503368861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7503368861 = 37 ⋅202793753.

It is a cyclic number.

It is not a de Polignac number, because 1688633057 - 2⁶ = 1688632993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1688633017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347783 + ... + 352604.

It is an arithmetic number, because the mean of its divisors is an integer number (422333964).

Almost surely, 2^1688633057 is an apocalyptic number.

It is an amenable number.

1688633057 is a deficient number, since it is larger than the sum of its proper divisors (702799).

1688633057 is an equidigital number, since it uses as much as digits as its factorization.

1688633057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702798.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 1688633057 is about 41092.9806292997. The cubic root of 1688633057 is about 1190.8171909715.

The spelling of 1688633057 in words is "one billion, six hundred eighty-eight million, six hundred thirty-three thousand, fifty-seven".