1265364644 has 12 divisors (see below), whose sum is σ = 2261503104. Its totient is φ = 619220904.

The previous prime is 1265364629. The next prime is 1265364671. The reversal of 1265364644 is 4464635621.

It is a super-2 number, since 2×1265364644² = 3202295364570493472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365144 + ... + 3365519.

It is an arithmetic number, because the mean of its divisors is an integer number (188458592).

Almost surely, 2^1265364644 is an apocalyptic number.

It is an amenable number.

1265364644 is a deficient number, since it is larger than the sum of its proper divisors (996138460).

1265364644 is a wasteful number, since it uses less digits than its factorization.

1265364644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6730714 (or 6730712 counting only the distinct ones).

The product of its digits is 414720, while the sum is 41.

The square root of 1265364644 is about 35571.9642977444. The cubic root of 1265364644 is about 1081.6130001344.

The spelling of 1265364644 in words is "one billion, two hundred sixty-five million, three hundred sixty-four thousand, six hundred forty-four".