1668842808 has 64 divisors (see below), whose sum is σ = 4650048000. Its totient is φ = 496000512.

The previous prime is 1668842807. The next prime is 1668842821. The reversal of 1668842808 is 8082488661.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668842801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99888 + ... + 115391.

It is an arithmetic number, because the mean of its divisors is an integer number (72657000).

Almost surely, 2^1668842808 is an apocalyptic number.

It is an amenable number.

1668842808 is an abundant number, since it is smaller than the sum of its proper divisors (2981205192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668842808 is a wasteful number, since it uses less digits than its factorization.

1668842808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215324 (or 215320 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 51.

The square root of 1668842808 is about 40851.4725315992. The cubic root of 1668842808 is about 1186.1468972421.

The spelling of 1668842808 in words is "one billion, six hundred sixty-eight million, eight hundred forty-two thousand, eight hundred eight".