1668100405 has 16 divisors (see below), whose sum is σ = 2029259520. Its totient is φ = 1316158272.

The previous prime is 1668100397. The next prime is 1668100439. The reversal of 1668100405 is 5040018661.

It is a cyclic number.

It is not a de Polignac number, because 1668100405 - 2³ = 1668100397 is a prime.

It is a super-2 number, since 2×1668100405² = 5565117922322328050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502762 + ... + 506068.

It is an arithmetic number, because the mean of its divisors is an integer number (126828720).

Almost surely, 2^1668100405 is an apocalyptic number.

It is an amenable number.

1668100405 is a deficient number, since it is larger than the sum of its proper divisors (361159115).

1668100405 is a wasteful number, since it uses less digits than its factorization.

1668100405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1668100405 is about 40842.3849083278. The cubic root of 1668100405 is about 1185.9709810075.

The spelling of 1668100405 in words is "one billion, six hundred sixty-eight million, one hundred thousand, four hundred five".