1265666506 has 16 divisors (see below), whose sum is σ = 2060642304. Its totient is φ = 579552624.

The previous prime is 1265666503. The next prime is 1265666531. The reversal of 1265666506 is 6056665621.

It is not an unprimeable number, because it can be changed into a prime (1265666503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188350 + ... + 194953.

It is an arithmetic number, because the mean of its divisors is an integer number (128790144).

Almost surely, 2^1265666506 is an apocalyptic number.

1265666506 is a deficient number, since it is larger than the sum of its proper divisors (794975798).

1265666506 is a wasteful number, since it uses less digits than its factorization.

1265666506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383445.

The product of its (nonzero) digits is 388800, while the sum is 43.

The square root of 1265666506 is about 35576.2070209852. The cubic root of 1265666506 is about 1081.6990021960.

The spelling of 1265666506 in words is "one billion, two hundred sixty-five million, six hundred sixty-six thousand, five hundred six".