1265117506121 has 4 divisors (see below), whose sum is σ = 1445848578432. Its totient is φ = 1084386433812.

The previous prime is 1265117506117. The next prime is 1265117506187. The reversal of 1265117506121 is 1216057115621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1265117506121 - 2² = 1265117506117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1265117506321) 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, 90365536145 + ... + 90365536158.

It is an arithmetic number, because the mean of its divisors is an integer number (361462144608).

Almost surely, 2^{1265117506121} is an apocalyptic number.

It is an amenable number.

1265117506121 is a deficient number, since it is larger than the sum of its proper divisors (180731072311).

1265117506121 is an equidigital number, since it uses as much as digits as its factorization.

1265117506121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180731072310.

The product of its (nonzero) digits is 25200, while the sum is 38.

The spelling of 1265117506121 in words is "one trillion, two hundred sixty-five billion, one hundred seventeen million, five hundred six thousand, one hundred twenty-one".