1265763257 has 8 divisors (see below), whose sum is σ = 1382213280. Its totient is φ = 1149543360.

The previous prime is 1265763253. The next prime is 1265763259. The reversal of 1265763257 is 7523675621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1265763257 - 2² = 1265763253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265763253) 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, 45923 + ... + 68120.

It is an arithmetic number, because the mean of its divisors is an integer number (172776660).

Almost surely, 2^1265763257 is an apocalyptic number.

It is an amenable number.

1265763257 is a deficient number, since it is larger than the sum of its proper divisors (116450023).

1265763257 is a wasteful number, since it uses less digits than its factorization.

1265763257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115063.

The product of its digits is 529200, while the sum is 44.

The square root of 1265763257 is about 35577.5667661520. The cubic root of 1265763257 is about 1081.7265641678.

The spelling of 1265763257 in words is "one billion, two hundred sixty-five million, seven hundred sixty-three thousand, two hundred fifty-seven".