1266665125 has 32 divisors (see below), whose sum is σ = 1728604800. Its totient is φ = 919024000.

The previous prime is 1266665119. The next prime is 1266665143. The reversal of 1266665125 is 5215666621.

It is not a de Polignac number, because 1266665125 - 2³ = 1266665117 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 781566 + ... + 783184.

It is an arithmetic number, because the mean of its divisors is an integer number (54018900).

Almost surely, 2^1266665125 is an apocalyptic number.

It is an amenable number.

1266665125 is a deficient number, since it is larger than the sum of its proper divisors (461939675).

1266665125 is a wasteful number, since it uses less digits than its factorization.

1266665125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214 (or 2204 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 1266665125 is about 35590.2391815509. The cubic root of 1266665125 is about 1081.9834165603.

The spelling of 1266665125 in words is "one billion, two hundred sixty-six million, six hundred sixty-five thousand, one hundred twenty-five".