1265256976 has 20 divisors (see below), whose sum is σ = 2451999312. Its totient is φ = 632482976.

The previous prime is 1265256973. The next prime is 1265257027. The reversal of 1265256976 is 6796525621.

It is not an unprimeable number, because it can be changed into a prime (1265256973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109491 + ... + 120493.

Almost surely, 2^1265256976 is an apocalyptic number.

1265256976 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1265256976 is a deficient number, since it is larger than the sum of its proper divisors (1186742336).

1265256976 is a wasteful number, since it uses less digits than its factorization.

1265256976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18198 (or 18192 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 49.

The square root of 1265256976 is about 35570.4508827201. The cubic root of 1265256976 is about 1081.5823216492.

The spelling of 1265256976 in words is "one billion, two hundred sixty-five million, two hundred fifty-six thousand, nine hundred seventy-six".