1668685337 has 32 divisors (see below), whose sum is σ = 1984466304. Its totient is φ = 1386112000.

The previous prime is 1668685331. The next prime is 1668685339. The reversal of 1668685337 is 7335868661.

It is a happy number.

It is not a de Polignac number, because 1668685337 - 2³⁰ = 594943513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (1668685331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1000178 + ... + 1001844.

It is an arithmetic number, because the mean of its divisors is an integer number (62014572).

Almost surely, 2^1668685337 is an apocalyptic number.

1668685337 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1668685337 is a deficient number, since it is larger than the sum of its proper divisors (315780967).

1668685337 is a wasteful number, since it uses less digits than its factorization.

1668685337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849.

The product of its digits is 4354560, while the sum is 53.

The square root of 1668685337 is about 40849.5451259864. The cubic root of 1668685337 is about 1186.1095880335.

The spelling of 1668685337 in words is "one billion, six hundred sixty-eight million, six hundred eighty-five thousand, three hundred thirty-seven".