1265133646 has 12 divisors (see below), whose sum is σ = 2207529288. Its totient is φ = 542200092.

The previous prime is 1265133619. The next prime is 1265133647. The reversal of 1265133646 is 6463315621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265133647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6454666 + ... + 6454861.

It is an arithmetic number, because the mean of its divisors is an integer number (183960774).

Almost surely, 2^1265133646 is an apocalyptic number.

1265133646 is a deficient number, since it is larger than the sum of its proper divisors (942395642).

1265133646 is a wasteful number, since it uses less digits than its factorization.

1265133646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12909543 (or 12909536 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 1265133646 is about 35568.7172386073. The cubic root of 1265133646 is about 1081.5471783583.

The spelling of 1265133646 in words is "one billion, two hundred sixty-five million, one hundred thirty-three thousand, six hundred forty-six".