1266632430640 has 20 divisors (see below), whose sum is σ = 2944920401424. Its totient is φ = 506652972224.

The previous prime is 1266632430631. The next prime is 1266632430641. The reversal of 1266632430640 is 460342366621.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1266632430641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7916452612 + ... + 7916452771.

Almost surely, 2^{1266632430640} is an apocalyptic number.

1266632430640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266632430640 is an abundant number, since it is smaller than the sum of its proper divisors (1678287970784).

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

1266632430640 is a wasteful number, since it uses less digits than its factorization.

1266632430640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15832905396 (or 15832905390 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 1266632430640 in words is "one trillion, two hundred sixty-six billion, six hundred thirty-two million, four hundred thirty thousand, six hundred forty".