1265318690 has 16 divisors (see below), whose sum is σ = 2309653440. Its totient is φ = 498998640.

The previous prime is 1265318689. The next prime is 1265318693. The reversal of 1265318690 is 968135621.

It is a super-2 number, since 2×1265318690² = 3202062774526632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1265318693) 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, 890360 + ... + 891779.

It is an arithmetic number, because the mean of its divisors is an integer number (144353340).

Almost surely, 2^1265318690 is an apocalyptic number.

1265318690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265318690 is a deficient number, since it is larger than the sum of its proper divisors (1044334750).

1265318690 is a wasteful number, since it uses less digits than its factorization.

1265318690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782217.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1265318690 is about 35571.3183618488. The cubic root of 1265318690 is about 1081.5999064001.

The spelling of 1265318690 in words is "one billion, two hundred sixty-five million, three hundred eighteen thousand, six hundred ninety".