921366668 has 12 divisors (see below), whose sum is σ = 1619496312. Its totient is φ = 458653440.

The previous prime is 921366661. The next prime is 921366703. The reversal of 921366668 is 866663129.

It is not an unprimeable number, because it can be changed into a prime (921366661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506453 + ... + 508268.

It is an arithmetic number, because the mean of its divisors is an integer number (134958026).

Almost surely, 2^921366668 is an apocalyptic number.

It is an amenable number.

921366668 is a deficient number, since it is larger than the sum of its proper divisors (698129644).

921366668 is a wasteful number, since it uses less digits than its factorization.

921366668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014952 (or 1014950 counting only the distinct ones).

The product of its digits is 559872, while the sum is 47.

The square root of 921366668 is about 30354.0222705328. The cubic root of 921366668 is about 973.0701843298.

The spelling of 921366668 in words is "nine hundred twenty-one million, three hundred sixty-six thousand, six hundred sixty-eight".