1266505531625 has 64 divisors (see below), whose sum is σ = 1678622400000. Its totient is φ = 951348499200.

The previous prime is 1266505531607. The next prime is 1266505531633. The reversal of 1266505531625 is 5261355056621.

It is a de Polignac number, because none of the positive numbers 2^k-1266505531625 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1266505531625.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 172333451 + ... + 172340799.

It is an arithmetic number, because the mean of its divisors is an integer number (26228475000).

Almost surely, 2^{1266505531625} is an apocalyptic number.

It is an amenable number.

1266505531625 is a deficient number, since it is larger than the sum of its proper divisors (412116868375).

1266505531625 is a wasteful number, since it uses less digits than its factorization.

1266505531625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8019 (or 8009 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 1266505531625 in words is "one trillion, two hundred sixty-six billion, five hundred five million, five hundred thirty-one thousand, six hundred twenty-five".