1264749807666 has 8 divisors (see below), whose sum is σ = 2529499615344. Its totient is φ = 421583269220.

The previous prime is 1264749807661. The next prime is 1264749807689. The reversal of 1264749807666 is 6667089474621.

It is a sphenic number, since it is the product of 3 distinct primes.

1264749807666 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1264749807597 and 1264749807606.

It is not an unprimeable number, because it can be changed into a prime (1264749807661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105395817300 + ... + 105395817311.

It is an arithmetic number, because the mean of its divisors is an integer number (316187451918).

Almost surely, 2^{1264749807666} is an apocalyptic number.

1264749807666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1264749807666 is a wasteful number, since it uses less digits than its factorization.

1264749807666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210791634616.

The product of its (nonzero) digits is 146313216, while the sum is 66.

The spelling of 1264749807666 in words is "one trillion, two hundred sixty-four billion, seven hundred forty-nine million, eight hundred seven thousand, six hundred sixty-six".