1668826408 has 8 divisors (see below), whose sum is σ = 3129049530. Its totient is φ = 834413200.

The previous prime is 1668826391. The next prime is 1668826409. The reversal of 1668826408 is 8046288661.

It can be written as a sum of positive squares in only one way, i.e., 1663171524 + 5654884 = 40782^2 + 2378^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1668826409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104301643 + ... + 104301658.

Almost surely, 2^1668826408 is an apocalyptic number.

It is an amenable number.

1668826408 is a deficient number, since it is larger than the sum of its proper divisors (1460223122).

1668826408 is a wasteful number, since it uses less digits than its factorization.

1668826408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208603307 (or 208603303 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 49.

The square root of 1668826408 is about 40851.2718039475. The cubic root of 1668826408 is about 1186.1430117408.

The spelling of 1668826408 in words is "one billion, six hundred sixty-eight million, eight hundred twenty-six thousand, four hundred eight".