1265260751261 has 16 divisors (see below), whose sum is σ = 1458613934400. Its totient is φ = 1087709223168.

The previous prime is 1265260751257. The next prime is 1265260751273. The reversal of 1265260751261 is 1621570625621.

It is a cyclic number.

It is not a de Polignac number, because 1265260751261 - 2² = 1265260751257 is a prime.

It is a super-2 number, since 2×1265260751261² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265260751761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43396556 + ... + 43425701.

It is an arithmetic number, because the mean of its divisors is an integer number (91163370900).

Almost surely, 2^{1265260751261} is an apocalyptic number.

It is an amenable number.

1265260751261 is a deficient number, since it is larger than the sum of its proper divisors (193353183139).

1265260751261 is a wasteful number, since it uses less digits than its factorization.

1265260751261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86822348.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 1265260751261 in words is "one trillion, two hundred sixty-five billion, two hundred sixty million, seven hundred fifty-one thousand, two hundred sixty-one".