1636606668 has 12 divisors (see below), whose sum is σ = 3818748920. Its totient is φ = 545535552.

The previous prime is 1636606639. The next prime is 1636606721. The reversal of 1636606668 is 8666066361.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 68191933 + ... + 68191956.

Almost surely, 2^1636606668 is an apocalyptic number.

It is an amenable number.

1636606668 is an abundant number, since it is smaller than the sum of its proper divisors (2182142252).

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

1636606668 is a wasteful number, since it uses less digits than its factorization.

1636606668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136383896 (or 136383894 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 48.

The square root of 1636606668 is about 40454.9955876898. The cubic root of 1636606668 is about 1178.4597993877.

The spelling of 1636606668 in words is "one billion, six hundred thirty-six million, six hundred six thousand, six hundred sixty-eight".