1264023666 has 24 divisors (see below), whose sum is σ = 2750686380. Its totient is φ = 419499936.

The previous prime is 1264023653. The next prime is 1264023671. The reversal of 1264023666 is 6663204621.

It can be written as a sum of positive squares in 2 ways, for example, as 1140480441 + 123543225 = 33771^2 + 11115^2 .

It is a super-3 number, since 3×1264023666³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1264023666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149205 + ... + 157448.

Almost surely, 2^1264023666 is an apocalyptic number.

1264023666 is an abundant number, since it is smaller than the sum of its proper divisors (1486662714).

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

1264023666 is a wasteful number, since it uses less digits than its factorization.

1264023666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306890 (or 306887 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 1264023666 is about 35553.1104968328. The cubic root of 1264023666 is about 1081.2307830636.

The spelling of 1264023666 in words is "one billion, two hundred sixty-four million, twenty-three thousand, six hundred sixty-six".