6635681366 has 16 divisors (see below), whose sum is σ = 10560514320. Its totient is φ = 3116305920.

The previous prime is 6635681359. The next prime is 6635681389. The reversal of 6635681366 is 6631865366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182051 + ... + 215438.

It is an arithmetic number, because the mean of its divisors is an integer number (660032145).

Almost surely, 2^6635681366 is an apocalyptic number.

6635681366 is a deficient number, since it is larger than the sum of its proper divisors (3924832954).

6635681366 is a wasteful number, since it uses less digits than its factorization.

6635681366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397999.

The product of its digits is 2799360, while the sum is 50.

The square root of 6635681366 is about 81459.6916640371. The cubic root of 6635681366 is about 1879.1517002411.

The spelling of 6635681366 in words is "six billion, six hundred thirty-five million, six hundred eighty-one thousand, three hundred sixty-six".