1012021666 has 16 divisors (see below), whose sum is σ = 1585479744. Its totient is φ = 483568624.

The previous prime is 1012021663. The next prime is 1012021711. The reversal of 1012021666 is 6661202101.

It is a self number, because there is not a number n which added to its sum of digits gives 1012021666.

It is not an unprimeable number, because it can be changed into a prime (1012021663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44040 + ... + 62956.

It is an arithmetic number, because the mean of its divisors is an integer number (99092484).

Almost surely, 2^1012021666 is an apocalyptic number.

1012021666 is a deficient number, since it is larger than the sum of its proper divisors (573458078).

1012021666 is a wasteful number, since it uses less digits than its factorization.

1012021666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20105.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1012021666 is about 31812.2879717885. The cubic root of 1012021666 is about 1003.9912705653.

Adding to 1012021666 its reverse (6661202101), we get a palindrome (7673223767).

The spelling of 1012021666 in words is "one billion, twelve million, twenty-one thousand, six hundred sixty-six".