1266663901540 has 48 divisors (see below), whose sum is σ = 2668459071600. Its totient is φ = 505054126080.

The previous prime is 1266663901523. The next prime is 1266663901549. The reversal of 1266663901540 is 451093666621.

It can be written as a sum of positive squares in 8 ways, for example, as 311102910756 + 955560990784 = 557766^2 + 977528^2 .

It is not an unprimeable number, because it can be changed into a prime (1266663901549) 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 15 ways as a sum of consecutive naturals, for example, 23432784 + ... + 23486776.

It is an arithmetic number, because the mean of its divisors is an integer number (55592897325).

Almost surely, 2^{1266663901540} is an apocalyptic number.

1266663901540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266663901540 is an abundant number, since it is smaller than the sum of its proper divisors (1401795170060).

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

1266663901540 is a wasteful number, since it uses less digits than its factorization.

1266663901540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57712 (or 57710 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 1266663901540 in words is "one trillion, two hundred sixty-six billion, six hundred sixty-three million, nine hundred one thousand, five hundred forty".